diff --git a/sys/libkern/ia64/__moddi3.S b/sys/libkern/ia64/__moddi3.S
index a1e330abc0a..5f36b4fc3d1 100644
--- a/sys/libkern/ia64/__moddi3.S
+++ b/sys/libkern/ia64/__moddi3.S
@@ -48,14 +48,14 @@ __moddi3:
   // 64-BIT SIGNED INTEGER REMAINDER BEGINS HERE
 
   // general register used:
-  //    r32 - 64-bit signed integer dividend
-  //    r33 - 64-bit signed integer divisor
+  //    r32 - 64-bit signed integer dividend, called a below
+  //    r33 - 64-bit signed integer divisor, called b below
   //    r8 - 64-bit signed integer result
   //    r2 - scratch register
   // floating-point registers used: f6, f7, f8, f9, f10, f11, f12
   // predicate registers used: p6
 
-  setf.sig f12=r32  // holds an in integer form
+  setf.sig f12=r32  // holds a in integer form
   setf.sig f7=r33
   nop.b 0
 } { .mlx
diff --git a/sys/libkern/ia64/__umoddi3.S b/sys/libkern/ia64/__umoddi3.S
index a4d8a0b4530..ebc23399e76 100644
--- a/sys/libkern/ia64/__umoddi3.S
+++ b/sys/libkern/ia64/__umoddi3.S
@@ -48,13 +48,13 @@ __umoddi3:
   // 64-BIT UNSIGNED INTEGER REMAINDER BEGINS HERE
 
   // general register used:
-  //    r32 - 64-bit unsigned integer dividend
-  //    r33 - 64-bit unsigned integer divisor
+  //    r32 - 64-bit unsigned integer dividend, called a below
+  //    r33 - 64-bit unsigned integer divisor, called b below
   //    r8 - 64-bit unsigned integer result
   // floating-point registers used: f6, f7, f8, f9, f10, f11, f12
   // predicate registers used: p6
 
-  setf.sig f12=r32  // holds an in integer form
+  setf.sig f12=r32  // holds a in integer form
   setf.sig f7=r33
   nop.b 0;;
 } { .mfi