diff --git a/libcortex_a9/src/lib.rs b/libcortex_a9/src/lib.rs
index 00814a9..2f341d3 100644
--- a/libcortex_a9/src/lib.rs
+++ b/libcortex_a9/src/lib.rs
@@ -66,7 +66,7 @@ macro_rules! interrupt_handler {
                 concat!("movtne r1, :upper16:", stringify!($stack1)),
                 "mov r0, sp",
                 "mov sp, r1",
-                "push {{r0, r1}}",                                      // for stack alignment 
+                "push {{r0, r1}}",                                      // 2 registers are pushed to maintain 8 byte stack alignment 
                 concat!("bl ", stringify!($name2)),
                 "pop {{r0, r1}}",
                 "mov sp, r0",