diff --git a/completions/groupmems b/completions/groupmems
index 627f8e01..b29d548d 100644
--- a/completions/groupmems
+++ b/completions/groupmems
@@ -14,6 +14,10 @@ _groupmems()
             COMPREPLY=( $( compgen -g -- "$cur" ) )
             return 0
             ;;
+        -R|--root)
+            _filedir -d
+            return 0
+            ;;
     esac
 
     if [[ "$cur" == -* ]]; then