diff --git a/website/docs/support/known-issues.md b/website/docs/support/known-issues.md
index 6f90e03cb..705e38b27 100644
--- a/website/docs/support/known-issues.md
+++ b/website/docs/support/known-issues.md
@@ -24,3 +24,5 @@ Below is a list of known Corso issues and limitations:
 
 * Exchange Calender Event instance exceptions (changes to a single event within a recurring series) aren't
 included in backup and restore.
+
+* Calendar backup and restore is only supported for calendars which belong to user's default calendar group.
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