diff --git a/mozilla/modules/libpref/public/nsPrefsCID.h b/mozilla/modules/libpref/public/nsPrefsCID.h
index 786172d6928..fd4e38805ff 100644
--- a/mozilla/modules/libpref/public/nsPrefsCID.h
+++ b/mozilla/modules/libpref/public/nsPrefsCID.h
@@ -43,7 +43,7 @@
  * allowed to access this pref. canAccessSecurityPreferences is called to
  * determine that.
  *
- * INTERFACES THAT NEED TO BE IMPLEMENTED:
+ * INTERFACES THAT MUST BE IMPLEMENTED:
  *   nsISupports
  *   nsIPrefSecurityCheck
  */