diff --git a/extra/alien/inline/compiler/compiler-docs.factor b/extra/alien/inline/compiler/compiler-docs.factor
index 28e2538e1f..a5c204ced1 100644
--- a/extra/alien/inline/compiler/compiler-docs.factor
+++ b/extra/alien/inline/compiler/compiler-docs.factor
@@ -66,6 +66,7 @@ HELP: library-suffix
 
 HELP: link-descr
 { $values
+    { "lang" "a language" }
     { "descr" sequence }
 }
 { $description "Returns part of a process description. OS dependent." } ;