diff --git a/CHANGELOG.md b/CHANGELOG.md
index df5b49e4..d34baf07 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 - [Docs] Mention the two available Spike-rule metrics that are add into the match record - [#1542](https://github.com/jertel/elastalert2/pull/1542) - @ulmako
 - [OpsGenie] Corrected spelling of the `opsgenie_default_receipients` configuration option to `opsgenie_default_recipients`. Both variations will continue to work and a warning message will notify affected users. [#1539](https://github.com/jertel/elastalert2/pull/1539) - @lstyles
 - [OpsGenie] Prevent templated `opsgenie_teams` and `opsgenie_recipients` from being overwritten with evaluated values first time an alert is sent. [#1540](https://github.com/jertel/elastalert2/issues/1540) [#1539](https://github.com/jertel/elastalert2/pull/1539) - @lstyles
+- [Docs] Add missing documentation of the timestamp_field option - [#1544](https://github.com/jertel/elastalert2/pull/1544) - @apollolv
 
 # 2.20.0
 
diff --git a/docs/source/ruletypes.rst b/docs/source/ruletypes.rst
index 8b57fe1e..890fe82c 100644
--- a/docs/source/ruletypes.rst
+++ b/docs/source/ruletypes.rst
@@ -142,6 +142,8 @@ Rule Configuration Cheat Sheet
 +--------------------------------------------------------------+           +
 | ``buffer_time`` (time, default from config.yaml)             |           |
 +--------------------------------------------------------------+           |
+| ``timestamp_field`` (string, default "@timestamp")           |           |
++--------------------------------------------------------------+           |
 | ``timestamp_type`` (string, default iso)                     |           |
 +--------------------------------------------------------------+           |
 | ``timestamp_format`` (string, default "%Y-%m-%dT%H:%M:%SZ")  |           |
@@ -971,6 +973,14 @@ summary_suffix
 
 ``summary_suffix``: Specify a suffix string, which will be added after the aggregation summary table. This string is currently not subject to any formatting.
 
+timestamp_field
+^^^^^^^^^^^^^^^
+
+``timestamp_field``: Specify the name of the document field containing the timestamp. 
+By default, the field ``@timestamp`` is used to query Elasticsearch. 
+If ``timestamp_field`` is set, this date field will be considered whenever querying, filtering and aggregating based on timestamps.
+(Optional, string, default @timestamp).
+
 timestamp_type
 ^^^^^^^^^^^^^^