diff --git a/doc/ref/chap-type-method.md b/doc/ref/chap-type-method.md
index 8d79e0782..ff007f083 100644
--- a/doc/ref/chap-type-method.md
+++ b/doc/ref/chap-type-method.md
@@ -820,8 +820,8 @@ An API the wraps the `$PS1` language.  For example, to simulate `PS1='\w\$ '`:
 
     func renderPrompt(io) {
       var parts = []
-      call parts->append(io.promptval('w'))  # pass 'w' for \w
-      call parts->append(io.promptval('$'))  # pass '$' for \$
+      call parts->append(io.promptVal('w'))  # pass 'w' for \w
+      call parts->append(io.promptVal('$'))  # pass '$' for \$
       call parts->append(' ')
       return (join(parts))
     }