diff --git a/docs/device_protocol.rst b/docs/device_protocol.rst
index c91fd78e..f76576a1 100644
--- a/docs/device_protocol.rst
+++ b/docs/device_protocol.rst
@@ -18,6 +18,7 @@ Device Protocol IDs
 - 14: `File <https://github.com/pyscada/PyScada-File>`_
 - 15: `MeterBus (MBus) <https://github.com/pyscada/PyScada-MeterBus>`_
 - 16: Generic dummy device
+- 17: `EMS <https://github.com/pyscada/PyScada-EMS`_
 - 8X: Custom Worker
 - 93 `Reserved (Serial) <https://github.com/clavay/PyScada-Serial>`_
 - 94 `Reserved (WebService) <https://github.com/clavay/PyScada-WebService>`_