diff --git a/docs/integrations/sources/facebook-marketing.md b/docs/integrations/sources/facebook-marketing.md
index fb06e53ae5aa..3a0d8758c2b6 100644
--- a/docs/integrations/sources/facebook-marketing.md
+++ b/docs/integrations/sources/facebook-marketing.md
@@ -114,6 +114,8 @@ You can segment the AdInsights table into parts based on the following informati
 * Region
 
 For more information, see the [Facebook Insights API documentation.](https://developers.facebook.com/docs/marketing-api/reference/adgroup/insights/)
+Pay attention, that not all fields (e.g. conversions, conversion_values) will be returned for AdInsights, see [docs](https://developers.facebook.com/docs/marketing-api/reference/ads-action-stats/).
+To get all fields You should use custom insights with **breakdowns**.
 
 ## Facebook Marketing Attribution Reporting
 Please be informed that the connector uses the `lookback_window` parameter to perform the repetitive read of the last `<lookback_window>` days in the Incremental sync mode. This means some data will be synced twice (or possibly more often) despite the cursor value being up-to-date. You can change this date window by modifying the `lookback_window` parameter when setting up the source. The smaller the value - the fewer duplicates you will have. The greater the value - the more precise results you will get. More details on what the attribution window is and what purpose it serves can be found in this [Facebook Article](https://www.facebook.com/business/help/458681590974355?id=768381033531365).