diff --git a/lib/types.nix b/lib/types.nix
index 9b2c5e846ad1..b11dca5e3fee 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -262,7 +262,8 @@ rec {
     };
 
     unspecified = mkOptionType {
-      name = "unspecified value";
+      name = "unspecified";
+      description = "unspecified value";
       descriptionClass = "noun";
     };