diff --git a/nixos/modules/security/pam.nix b/nixos/modules/security/pam.nix
index def4227d34ce..01b5603dbf2d 100644
--- a/nixos/modules/security/pam.nix
+++ b/nixos/modules/security/pam.nix
@@ -2249,7 +2249,7 @@ in
       };
     };
 
-    security.pam.enableUMask = lib.mkEnableOption "umask PAM module";
+    security.pam.enableUMask = lib.mkEnableOption "the umask PAM module";
 
     security.pam.enableFscrypt = lib.mkEnableOption ''
       fscrypt, to automatically unlock directories with the user's login password.