diff --git a/source/_components/calendar.google.markdown b/source/_components/calendar.google.markdown
index f47ee421ac3..cfb94721485 100644
--- a/source/_components/calendar.google.markdown
+++ b/source/_components/calendar.google.markdown
@@ -129,7 +129,8 @@ entities:
     offset:
       description: >
         A set of characters that precede a number in the event title
-        for designating a pre-trigger state change on the sensor.
+        for designating a pre-trigger state change on the sensor. 
+        This should be in the format of HH:MM or MM.
       required: false
       type: string
       default: "!!"