diff --git a/src/awesomewm.d.tl/entity/Function_Info.tl b/src/awesomewm.d.tl/entity/Function_Info.tl
index d3e3478..534da92 100644
--- a/src/awesomewm.d.tl/entity/Function_Info.tl
+++ b/src/awesomewm.d.tl/entity/Function_Info.tl
@@ -18,7 +18,7 @@ local record Function_Info
    parameters: List<Variable_Info.Variable_Info>
    return_types: List<Type_Info.Type_Info>
 
-   append_parameter: function(self: Function_Info, name: string, type: string)
+   append_parameter: function(self: Function_Info, name: string, types: List<Type_Info.Type_Info>)
    append_return_type: function(self: Function_Info, return_type: string)
 
    fixup: function(Function_Info)