diff --git a/src/cmd/go/doc.go b/src/cmd/go/doc.go
index ba1a707132..58905d913f 100644
--- a/src/cmd/go/doc.go
+++ b/src/cmd/go/doc.go
@@ -271,6 +271,8 @@ Go generate sets several variables when it runs the generator:
 		The base name of the file.
 	$GOPACKAGE
 		The name of the package of the file containing the directive.
+	$DOLLAR
+		A dollar sign.
 
 Other than variable substitution and quoted-string evaluation, no
 special processing such as "globbing" is performed on the command