diff --git a/src/main.rs b/src/main.rs
index b81a7ae..f508164 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,7 +34,7 @@ struct Cli {
 }
 
 fn main() {
-    env_logger::init();
+    env_logger::init(); // TODO add more logging
 
     let cli = Cli::parse();
 
@@ -42,6 +42,9 @@ fn main() {
         error!("No lists or configuration provided.");
     }
 
-    // TODO argument parsing - IN PROGRESS
-    // TODO logging
+    // TODO parse config file if one is provided
+
+    // TODO read modsources from files
+    // TODO combine modsources into modmap
+    // TODO write modmap to files
 }
diff --git a/src/manip.rs b/src/manip.rs
index 9a38e76..a7ce984 100644
--- a/src/manip.rs
+++ b/src/manip.rs
@@ -4,35 +4,35 @@ use log::error;
 
 // ENUMS
 
-/// Specifies a moderation action, whether block or silence
+/// Specifies a limit type, whether block or silence
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub enum ModAction {
+pub enum Limit {
     Block,
     Silence,
 }
 
 // STRUCTS
 
-/// Indicates weight of moderation action on a host
+/// Wraps a host's weighted limits
 #[derive(Debug, Default, Eq, PartialEq)]
-pub struct ModActionTrust {
+pub struct LimitIndices {
     pub block: u16,
     pub silence: u16,
 }
 
-impl ModActionTrust {
-    pub fn add_action(&mut self, action: ModAction, trust: u16) -> &mut Self {
-        match action {
-            ModAction::Block => self.block += trust,
-            ModAction::Silence => self.silence += trust,
+impl LimitIndices {
+    pub fn add_limit(&mut self, limit: Limit, weight: u16) -> &mut Self {
+        match limit {
+            Limit::Block => self.block += weight,
+            Limit::Silence => self.silence += weight,
         }
         self
     }
 }
 
-impl From<(u16, u16)> for ModActionTrust {
-    /// Creates mod action weights from a tuple of two `u16` weights. Useful
-    /// mostly for testing.
+impl From<(u16, u16)> for LimitIndices {
+    /// Creates indices from a tuple of two `u16` weights. Useful mostly for
+    /// testing.
     fn from(value: (u16, u16)) -> Self {
         Self {
             block: value.0,
@@ -41,67 +41,69 @@ impl From<(u16, u16)> for ModActionTrust {
     }
 }
 
-/// Contains a mapping of hosts to moderation actions as well as a trust value,
-/// which is used to weight moderation actions when building a mod map
+/// Contains a mapping of hosts to limits as well as a trust value which is
+/// used to weight limits when building a merged list
 #[derive(Debug, PartialEq, Eq)]
-pub struct ModSource {
-    pub actions: HashMap<String, ModAction>,
+pub struct LimitList {
+    pub limits: HashMap<String, Limit>,
     pub trust: u16,
 }
 
-impl Default for ModSource {
+impl Default for LimitList {
     fn default() -> Self {
         Self {
-            actions: HashMap::new(),
+            limits: HashMap::new(),
             trust: 100,
         }
     }
 }
 
-impl From<HashMap<String, ModAction>> for ModSource {
-    fn from(map: HashMap<String, ModAction>) -> Self {
+impl From<HashMap<String, Limit>> for LimitList {
+    fn from(map: HashMap<String, Limit>) -> Self {
         Self {
-            actions: map,
+            limits: map,
             trust: 100,
         }
     }
 }
 
-impl ModSource {
-    fn add_action(&mut self, host: &str, action: ModAction) -> &mut Self {
-        self.actions.insert(host.to_string(), action);
+impl LimitList {
+    fn add_host(&mut self, host: &str, limit: Limit) -> &mut Self {
+        self.limits.insert(host.to_string(), limit);
         self
     }
 
-    pub fn build(map: HashMap<String, ModAction>, trust: u16) -> Self {
+    pub fn build(map: HashMap<String, Limit>, trust: u16) -> Self {
         let mut src = Self::from(map);
         src.trust = trust;
         src
     }
 
-    pub fn import_file(&mut self, path: &str, action: ModAction) -> &mut Self {
+    pub fn import_file(&mut self, path: &str, limit: Limit) -> &mut Self {
         let contents = fs::read_to_string(path).unwrap();
         for host in contents.lines().filter(|line| !line.is_empty()) {
-            self.add_action(host, action);
+            self.add_host(host, limit);
         }
 
         self
     }
 }
 
-/// A map of hosts (as strings) to weighted mod actions
+/// A map of hosts (as strings) to their limit weights
 #[derive(Debug, Default, Eq, PartialEq)]
-pub struct ModMap(pub HashMap<String, ModActionTrust>);
+pub struct MergedLimitList {
+    pub map: HashMap<String, LimitIndices>,
+    pub max: u16,
+}
 
-impl ModMap {
-    pub fn add_source(&mut self, src: ModSource) -> &mut Self {
-        let items = src.actions.into_iter();
-
-        for (host, action) in items {
-            let entry = self.0.entry(host).or_default();
-            entry.add_action(action, src.trust);
+impl MergedLimitList {
+    pub fn add_limit_list(&mut self, src: LimitList) -> &mut Self {
+        for (host, limit) in src.limits.into_iter() {
+            let entry = self.map.entry(host).or_default();
+            entry.add_limit(limit, src.trust);
         }
 
+        self.max += src.trust;
         self
     }
 
@@ -109,18 +111,18 @@ impl ModMap {
         self,
         block_path: &str,
         mute_path: &str,
-        heat: (u16, u16),
+        indices: (u16, u16),
     ) -> std::io::Result<()> {
-        if self.0.is_empty() {
+        if self.map.is_empty() {
             error!("Nothing to export!");
             return Ok(());
         }
 
-        let (block_thresh, mute_thresh) = heat;
+        let (block_thresh, mute_thresh) = indices;
         let mut block_output: String = String::default();
         let mut mute_output: String = String::default();
 
-        for item in self.0.into_iter() {
+        for item in self.map.into_iter() {
             let (block_trust, mute_trust) = (item.1.block, item.1.silence);
 
             if block_trust >= block_thresh {
diff --git a/src/tests/manip.rs b/src/tests/manip.rs
index 7d9f5b5..a405693 100644
--- a/src/tests/manip.rs
+++ b/src/tests/manip.rs
@@ -5,13 +5,13 @@ use std::{collections::HashMap, fs};
 use crate::manip::*;
 
 #[test]
-fn modaction_add() {
-    let mut at = ModActionTrust::default();
+fn limit_add() {
+    let mut at = LimitIndices::default();
 
-    at.add_action(ModAction::Block, 123)
-        .add_action(ModAction::Silence, 456);
+    at.add_limit(Limit::Block, 123)
+        .add_limit(Limit::Silence, 456);
 
-    let test_at = ModActionTrust {
+    let test_at = LimitIndices {
         block: 123,
         silence: 456,
     };
@@ -20,14 +20,14 @@ fn modaction_add() {
 }
 
 #[test]
-fn modaction_combine() {
-    let mut at = ModActionTrust::default();
+fn limit_combine() {
+    let mut at = LimitIndices::default();
 
-    at.add_action(ModAction::Block, 123)
-        .add_action(ModAction::Block, 333)
-        .add_action(ModAction::Silence, 123);
+    at.add_limit(Limit::Block, 123)
+        .add_limit(Limit::Block, 333)
+        .add_limit(Limit::Silence, 123);
 
-    let test_at = ModActionTrust {
+    let test_at = LimitIndices {
         block: 456,
         silence: 123,
     };
@@ -36,19 +36,19 @@ fn modaction_combine() {
 }
 
 #[test]
-fn modsource_from_map() {
-    let src1 = ModSource::from(HashMap::from([
-        (String::from("example.com"), ModAction::Block),
-        (String::from("example.org"), ModAction::Silence),
-        (String::from("example.net"), ModAction::Block),
+fn limitlist_from_map() {
+    let src1 = LimitList::from(HashMap::from([
+        (String::from("example.com"), Limit::Block),
+        (String::from("example.org"), Limit::Silence),
+        (String::from("example.net"), Limit::Block),
     ]));
 
     assert_eq!(
-        src1.actions,
+        src1.limits,
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.org"), ModAction::Silence),
-            (String::from("example.net"), ModAction::Block),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.org"), Limit::Silence),
+            (String::from("example.net"), Limit::Block),
         ])
     );
 
@@ -56,139 +56,145 @@ fn modsource_from_map() {
 }
 
 #[test]
-fn modsource_from_map_and_trust() {
-    let src2 = ModSource::build(
+fn limitlist_from_map_and_trust() {
+    let src2 = LimitList::build(
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.org"), ModAction::Silence),
-            (String::from("example.net"), ModAction::Block),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.org"), Limit::Silence),
+            (String::from("example.net"), Limit::Block),
         ]),
         123,
     );
 
     assert_eq!(
-        src2.actions,
+        src2.limits,
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.org"), ModAction::Silence),
-            (String::from("example.net"), ModAction::Block),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.org"), Limit::Silence),
+            (String::from("example.net"), Limit::Block),
         ])
     );
     assert_eq!(src2.trust, 123);
 }
 
 #[test]
-fn modsource_from_file() {
-    let mut src = ModSource::default();
-    src.import_file("test/example_blocklist.txt", ModAction::Block)
-        .import_file("test/example_mutelist.txt", ModAction::Silence);
+fn limitlist_from_file() {
+    let mut src = LimitList::default();
+    src.import_file("test/example_blocklist.txt", Limit::Block)
+        .import_file("test/example_mutelist.txt", Limit::Silence);
 
-    let test_src = ModSource::from(HashMap::from([
-        (String::from("example.com"), ModAction::Block),
-        (String::from("example.org"), ModAction::Block),
-        (String::from("example.net"), ModAction::Silence),
+    let test_src = LimitList::from(HashMap::from([
+        (String::from("example.com"), Limit::Block),
+        (String::from("example.org"), Limit::Block),
+        (String::from("example.net"), Limit::Silence),
     ]));
 
     assert_eq!(test_src, src);
 }
 
 #[test]
-fn modmap_from_modsource() {
-    let mut ml = ModMap::default();
+fn mergedlist_from_limitlist() {
+    let mut ml = MergedLimitList::default();
 
-    let src1 = ModSource::from(HashMap::from([
-        (String::from("example.com"), ModAction::Block),
-        (String::from("example.org"), ModAction::Silence),
-        (String::from("example.net"), ModAction::Block),
+    let src1 = LimitList::from(HashMap::from([
+        (String::from("example.com"), Limit::Block),
+        (String::from("example.org"), Limit::Silence),
+        (String::from("example.net"), Limit::Block),
     ]));
 
-    let mut src2 = ModSource::default();
-    src2.import_file("test/example_blocklist.txt", ModAction::Block)
-        .import_file("test/example_mutelist.txt", ModAction::Silence);
+    let mut src2 = LimitList::default();
+    src2.import_file("test/example_blocklist.txt", Limit::Block)
+        .import_file("test/example_mutelist.txt", Limit::Silence);
 
-    ml.add_source(src1).add_source(src2);
+    ml.add_limit_list(src1).add_limit_list(src2);
 
-    let test_ml = ModMap(HashMap::from([
-        (String::from("example.com"), ModActionTrust::from((200, 0))),
-        (
-            String::from("example.org"),
-            ModActionTrust::from((100, 100)),
-        ),
-        (
-            String::from("example.net"),
-            ModActionTrust::from((100, 100)),
-        ),
-    ]));
+    let test_ml = MergedLimitList {
+        map: HashMap::from([
+            (String::from("example.com"), LimitIndices::from((200, 0))),
+            (
+                String::from("example.org"),
+                LimitIndices::from((100, 100)),
+            ),
+            (
+                String::from("example.net"),
+                LimitIndices::from((100, 100)),
+            ),
+        ]),
+        max: 200,
+    };
 
     assert_eq!(ml, test_ml);
 
-    let src3 = ModSource::build(
+    let src3 = LimitList::build(
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.org"), ModAction::Silence),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.org"), Limit::Silence),
         ]),
         200,
     );
 
-    let src4 = ModSource::build(
+    let src4 = LimitList::build(
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.net"), ModAction::Silence),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.net"), Limit::Silence),
         ]),
         50,
     );
 
-    ml.add_source(src3).add_source(src4);
+    ml.add_limit_list(src3).add_limit_list(src4);
 
-    let test_ml = ModMap(HashMap::from([
-        (String::from("example.com"), ModActionTrust::from((450, 0))),
-        (
-            String::from("example.org"),
-            ModActionTrust::from((100, 300)),
-        ),
-        (
-            String::from("example.net"),
-            ModActionTrust::from((100, 150)),
-        ),
-    ]));
+    let test_ml = MergedLimitList {
+        map: HashMap::from([
+            (String::from("example.com"), LimitIndices::from((450, 0))),
+            (
+                String::from("example.org"),
+                LimitIndices::from((100, 300)),
+            ),
+            (
+                String::from("example.net"),
+                LimitIndices::from((100, 150)),
+            ),
+        ]),
+        max: 450,
+    };
 
     assert_eq!(ml, test_ml);
 }
 
 #[test]
-fn modmap_export_txt() {
-    let mut ml = ModMap::default();
+fn mergedlist_export_txt() {
+    let mut ml = MergedLimitList::default();
 
-    let src1 = ModSource::from(HashMap::from([
-        (String::from("example.com"), ModAction::Block),
-        (String::from("example.org"), ModAction::Silence),
-        (String::from("example.net"), ModAction::Block),
+    let src1 = LimitList::from(HashMap::from([
+        (String::from("example.com"), Limit::Block),
+        (String::from("example.org"), Limit::Silence),
+        (String::from("example.net"), Limit::Block),
     ]));
 
-    let mut src2 = ModSource::default();
-    src2.import_file("test/example_blocklist.txt", ModAction::Block)
-        .import_file("test/example_mutelist.txt", ModAction::Silence);
+    let mut src2 = LimitList::default();
+    src2.import_file("test/example_blocklist.txt", Limit::Block)
+        .import_file("test/example_mutelist.txt", Limit::Silence);
 
-    let src3 = ModSource::build(
+    let src3 = LimitList::build(
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.org"), ModAction::Silence),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.org"), Limit::Silence),
         ]),
         200,
     );
 
-    let src4 = ModSource::build(
+    let src4 = LimitList::build(
         HashMap::from([
-            (String::from("example.com"), ModAction::Block),
-            (String::from("example.net"), ModAction::Silence),
+            (String::from("example.com"), Limit::Block),
+            (String::from("example.net"), Limit::Silence),
         ]),
         50,
     );
 
-    ml.add_source(src1)
-        .add_source(src2)
-        .add_source(src3)
-        .add_source(src4);
+    ml.add_limit_list(src1)
+        .add_limit_list(src2)
+        .add_limit_list(src3)
+        .add_limit_list(src4);
 
     let _ = ml.export_file("test/test_blocks.txt", "test/test_mutes.txt", (200, 150));