diff --git a/docs/built-in-functions.rst b/docs/built-in-functions.rst
index d1ab252147..1faf2a4c6e 100644
--- a/docs/built-in-functions.rst
+++ b/docs/built-in-functions.rst
@@ -364,7 +364,7 @@ Data Manipulation
 
         @external
         @view
-        def foo(s: string[32]) -> string[5]:
+        def foo(s: String[32]) -> String[5]:
             return slice(s, 4, 5)
 
     .. code-block:: python