diff --git a/docs/user-defined-type-functions.md b/docs/user-defined-type-functions.md
index 1b8fd5a..401c153 100644
--- a/docs/user-defined-type-functions.md
+++ b/docs/user-defined-type-functions.md
@@ -159,7 +159,7 @@ This section details the initial programming interface we propose for `type`s wh
 | ------------- | ------------- | ------------- |
 | `setparameters(pack: {type}?, variadic: type?)` | `nil` | sets the function's parameter types to the arguments |
 | `parameters()` | `{pack: {type}?, variadic: type?}` | returns the function's parameter types as a table |
-| `setreturns(pack: {type}?, variadic: type?)` | `nil` | sets the function's return types to the arguments |
+| `setreturns(pack: {type}?, variadic: type?)` | () | sets the function's return types to the arguments |
 | `returns()` | `{pack: {type}?, variadic: type?}` | returns the function's return types as a table |
 
 #### Union