diff --git a/opts/opts.go b/opts/opts.go
index 8dcc8c5988..e40c1a334a 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -193,6 +193,8 @@ func ValidateLink(val string) (string, error) {
 	return val, nil
 }
 
+// ValidatePath will make sure 'val' is in the form:
+//    [host-dir:]container-path[:rw|ro]  - but doesn't validate the mode part
 func ValidatePath(val string) (string, error) {
 	var containerPath string