docs: Elaborate on touch timeout

Author: paveltiunov

docs/pages/product/configuration/reference/environment-variables.mdx

@@ -1303,6 +1303,12 @@ Required port to send where collector server accept UDP connections.
 
 ## `CUBEJS_TOUCH_PRE_AGG_TIMEOUT`
 
+<WarningBox>
+
+If the refresh worker’s throughput isn’t sufficient and the Cube Refresh Worker can’t refresh every partition, Cube will start dropping partitions once the timeout is reached.
+
+</WarningBox>
+
 The number of seconds without a touch before pre-aggregation is considered
 orphaned and marked for removal. Please see
 [`CUBEJS_DROP_PRE_AGG_WITHOUT_TOUCH`](#cubejs-drop-pre-agg-without-touch) to
@@ -1748,4 +1754,4 @@ The port for a Cube deployment to listen to API connections on.
 [mysql-server-tz-support]: https://dev.mysql.com/doc/refman/8.4/en/time-zone-support.html
 [ref-schema-ref-preagg-allownonstrict]: /product/data-modeling/reference/pre-aggregations#allow_non_strict_date_range_match
 [link-tesseract]: https://cube.dev/blog/introducing-next-generation-data-modeling-engine
-[ref-multi-stage-calculations]: /product/data-modeling/concepts/multi-stage-calculations
+[ref-multi-stage-calculations]: /product/data-modeling/concepts/multi-stage-calculations