diff --git a/The-Ultimate-Rooting-Guide.md b/The-Ultimate-Rooting-Guide.md
index 3c920bb..3be1ae4 100644
--- a/The-Ultimate-Rooting-Guide.md
+++ b/The-Ultimate-Rooting-Guide.md
@@ -4,6 +4,10 @@ This guide provides basic rooting procedure in details. If you are new, this is
 
 If you already hacked the system, but want to upgrade, please use [this guide](https://github.com/HappyZ/dpt-tools/wiki/The-Upgrade-Guide).
 
+## Versions
+
+It works on any DPT-RP1s or DPT-CP1s with version number `1.6.00.15110` or below as of 06/03/2019.
+
 # Requirements
 
 ### Software