diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4cfaa09..9b357333 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@
 - TBD
 
 ## Other changes
-- TBD
+- [Docs] Clarify docs to state that alert_time_limit should not be 0 - [#1208](https://github.com/jertel/elastalert2/pull/1208) - @jertel
 
 # 2.12.0
 
diff --git a/docs/source/running_elastalert.rst b/docs/source/running_elastalert.rst
index 4d74c074..7c19fe0e 100644
--- a/docs/source/running_elastalert.rst
+++ b/docs/source/running_elastalert.rst
@@ -292,7 +292,7 @@ connections
 ``writeback_index`` is the name of the index in which ElastAlert 2 will store
 data. We will create this index later.
 
-``alert_time_limit`` is the retry window for failed alerts.
+``alert_time_limit`` is the retry window for failed alerts. Must be greater than zero.
 
 Save the file as ``config.yaml``