diff --git a/documentation/Reference.txt b/documentation/Reference.txt
index 3d5348c20cadd5788b5d9dbc1b889ffa3120f246..d9efbd5eb40ed9457a3eeb66fc1d59a5d4918e3d 100644
--- a/documentation/Reference.txt
+++ b/documentation/Reference.txt
@@ -419,6 +419,7 @@ Type Expressions
    abs_decl: "*" `abs_decl`
    abs_decl: "const"
    abs_decl: "const" `abs_decl`
+   param_decls: 
    param_decls: `param_decl`
    param_decls: `param_decls` "," `param_decl`
    param_decl: `basetype` `declarator`