diff --git a/compiler/builtins/src/std.rs b/compiler/builtins/src/std.rs
index 5c55933fe0..61ec3b2c44 100644
--- a/compiler/builtins/src/std.rs
+++ b/compiler/builtins/src/std.rs
@@ -498,7 +498,7 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         ),
     );
 
-    // push : List a -> a -> List a
+    // push : List elem -> elem -> List elem
     add_type(
         Symbol::LIST_PUSH,
         SolvedType::Func(
@@ -513,7 +513,7 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         SolvedType::Func(vec![flex(TVAR1)], Box::new(list_type(flex(TVAR1)))),
     );
 
-    // repeat : Int, a -> List a
+    // repeat : Int, elem -> List elem
     add_type(
         Symbol::LIST_REPEAT,
         SolvedType::Func(
diff --git a/compiler/builtins/src/unique.rs b/compiler/builtins/src/unique.rs
index 760ec6ef06..f895f02523 100644
--- a/compiler/builtins/src/unique.rs
+++ b/compiler/builtins/src/unique.rs
@@ -615,7 +615,7 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         )
     });
 
-    // repeat : Int, a -> List a
+    // repeat : Int, elem -> List elem
     add_type(Symbol::LIST_REPEAT, {
         let u = UVAR1;
         let v = UVAR2;