diff --git a/collects/syntax/scribblings/strip-context.scrbl b/collects/syntax/scribblings/strip-context.scrbl
index e36bff5850..41e38b7314 100644
--- a/collects/syntax/scribblings/strip-context.scrbl
+++ b/collects/syntax/scribblings/strip-context.scrbl
@@ -2,7 +2,7 @@
 @(require "common.ss"
           (for-label syntax/strip-context))
 
-@title[#:tag "strip-context"]{Stripping Lexical Context}
+@title[#:tag "strip-context"]{Replacing Lexical Context}
 
 @defmodule[syntax/strip-context]
 
@@ -11,7 +11,7 @@
 Removes all lexical context from @scheme[stx], preserving
 source-location information and properties.}
 
-@defproc[(replace-context [ctx-stx syntax?] [stx syntax?]) syntax?]{
+@defproc[(replace-context [ctx-stx (or/c syntax? #f)] [stx syntax?]) syntax?]{
 
 Uses the lexical context of @scheme[ctx-stx] to replace the lexical
 context of all parts of @scheme[stx], preserving source-location