diff --git a/src/main.rs b/src/main.rs
index 420df16..cf4e06a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,10 +14,11 @@ mod uart;
 unsafe extern "C" fn _enter() -> ! {
     use core::arch::asm;
     asm!(
+        // load hartid into t0; if t0 =/= 0, then jump to busy loop
         "csrr t0, mhartid",
         "bnez t0, 3f",
         // before we use the `la` pseudo-instruction for the first time,
-        // we need to set `gp` (google linker relaxation)
+        // we need to set `gp` (look up linker relaxation)
         ".option push", // pushes the current option stack
         ".option norelax", // disable relaxation so we can properly set `gp`
         // this instruction compiles to:
@@ -41,6 +42,7 @@ unsafe extern "C" fn _enter() -> ! {
     "2:",
         // BSS is clear!
         "j 4f",
+        // busy loop if hartid =/= 0
     "3:",
         "wfi",
         "j 3b",