diff --git a/src/connections/destinations/catalog/actions-mixpanel/index.md b/src/connections/destinations/catalog/actions-mixpanel/index.md
index f5b5aa24ea..5aee0cfe57 100644
--- a/src/connections/destinations/catalog/actions-mixpanel/index.md
+++ b/src/connections/destinations/catalog/actions-mixpanel/index.md
@@ -112,6 +112,10 @@ The group id that Mixpanel will use is `12345`.
 {% endcapture %}
 
 {% include components/actions-fields.html content1=track_purchase_details section1="trackPurchase" content2=group_identify_user_details section2="groupIdentifyUser" content3=identify_user_details section3="identifyUser" %}
+
+> info "Anonymous ID format"
+> [Mixpanel](https://developer.mixpanel.com/reference/create-identity#create-identity){:target="_blank"} requires that values it receives for the anonymous identifier (`anonymousId` in Segment) must be in the UUID v4 format. Analytics.js sends `anonymousId` in this format by default. If you manually send anonymous identifiers to Mixpanel, ensure they are in the correct format.
+
 ## Migration from Mixpanel Classic
 
 {% include content/ajs-upgrade.md %}
@@ -123,4 +127,4 @@ If you want to confirm, you can configure the new destination to point to a diff
 > info ""
 > Contact Mixpanel support if you find features missing from the Mixpanel (Actions) destination that were available in the classic Mixpanel destination.
 
-{% include components/actions-map-table.html name="mixpanel" %}
\ No newline at end of file
+{% include components/actions-map-table.html name="mixpanel" %}