diff --git a/crates/nu-protocol/src/signature.rs b/crates/nu-protocol/src/signature.rs
index ba2061a842..f6d95b7616 100644
--- a/crates/nu-protocol/src/signature.rs
+++ b/crates/nu-protocol/src/signature.rs
@@ -208,7 +208,7 @@ impl Signature {
         self
     }
 
-    /// Add a required positional argument to the signature
+    /// Add an optional positional argument to the signature
     pub fn optional(
         mut self,
         name: impl Into<String>,