diff --git a/src/cmd/compile/doc.go b/src/cmd/compile/doc.go
index f70c1cf6d4..2b45e5b998 100644
--- a/src/cmd/compile/doc.go
+++ b/src/cmd/compile/doc.go
@@ -79,6 +79,8 @@ Flags:
 		Write a package (archive) file rather than an object file
 	-race
 		Compile with race detector enabled.
+	-trimpath prefix
+		Remove prefix from recorded source file paths.
 	-u
 		Disallow importing packages not marked as safe; implies -nolocalimports.