diff --git a/source/_docs/mqtt/discovery.markdown b/source/_docs/mqtt/discovery.markdown
index eff3760e77f..2f9fb500a39 100644
--- a/source/_docs/mqtt/discovery.markdown
+++ b/source/_docs/mqtt/discovery.markdown
@@ -117,6 +117,7 @@ Supported abbreviations:
     'dock_t':              'docked_topic',
     'dock_tpl':            'docked_template',
     'e':                   'encoding',
+    'ent_cat':             'entity_category,
     'err_t':               'error_topic',
     'err_tpl':             'error_template',
     'fanspd_t':            'fan_speed_topic',