diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index d70fcd1ae8a8..df7b7196a243 100644
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -138,7 +138,7 @@ impl LanguageItems {
         }
     }
 
-    // XXX: Method macros sure would be nice here.
+    // FIXME #4621: Method macros sure would be nice here.
 
     pub fn const_trait(&const self) -> def_id {
         self.items[ConstTraitLangItem as uint].get()
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index 96fce53dd63b..63161a6302e5 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -720,7 +720,8 @@ fn check_item_ctypes(cx: ty::ctxt, it: @ast::item) {
               ast::foreign_item_fn(decl, _, _) => {
                 check_foreign_fn(cx, it.id, decl);
               }
-              ast::foreign_item_const(*) => {}  // XXX: Not implemented.
+              // FIXME #4622: Not implemented.
+              ast::foreign_item_const(*) => {}
             }
         }
       }