diff --git a/src/path/filepath/path_unix.go b/src/path/filepath/path_unix.go
index 2d242cc0b5..dddcac0a5c 100644
--- a/src/path/filepath/path_unix.go
+++ b/src/path/filepath/path_unix.go
@@ -20,6 +20,8 @@ func volumeNameLen(path string) int {
 }
 
 // HasPrefix exists for historical compatibility and should not be used.
+//
+// Deprecated: Use strings.HasPrefix instead.
 func HasPrefix(p, prefix string) bool {
 	return strings.HasPrefix(p, prefix)
 }