diff --git a/doc/rust.md b/doc/rust.md
index 08c04c6c8887e..b33006733ab37 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -209,7 +209,7 @@ break
 do
 else enum extern
 false fn for
-if impl
+if impl in
 let loop
 match mod mut
 priv pub