diff --git a/plugins/modules/grafana_datasource.py b/plugins/modules/grafana_datasource.py
index 3c0b412b..154dc451 100644
--- a/plugins/modules/grafana_datasource.py
+++ b/plugins/modules/grafana_datasource.py
@@ -166,7 +166,7 @@
     default: '@timestamp'
   time_interval:
     description:
-    - Minimum group by interval for C(influxdb) or C(elasticsearch) datasources.
+    - Minimum group by interval for C(influxdb), C(elasticsearch) or C(prometheus) datasources.
     - for example C(>10s).
     type: str
   interval: