diff --git a/docs/search/search_operators.rst b/docs/search/search_operators.rst
index 1d2f923f..1f6ee406 100644
--- a/docs/search/search_operators.rst
+++ b/docs/search/search_operators.rst
@@ -58,6 +58,8 @@ Contacts search filters
     is:mine
     email:*
     segment:{segment_alias}
+    source:manually_added
+    source:filter_added
     name:*
     company:*
     owner:*
@@ -71,6 +73,10 @@ Contacts search filters
     email_queued:EMAIL_ID
     email_pending:EMAIL_ID
 
+.. note::
+
+   Combine the ``source:`` filter with the ``segment:`` filter to break down a Segment's membership by how Contacts joined it. ``source:manually_added`` returns Contacts added manually, including those who subscribed through the Preference Center, and ``source:filter_added`` returns Contacts that Mautic added automatically based on the Segment's filter rules. On its own, without a ``segment:`` filter, ``source:`` returns no results.
+
 Companies search filters
 ------------------------
 
diff --git a/docs/segments/images/segment_contacts_stat_cards.png b/docs/segments/images/segment_contacts_stat_cards.png
new file mode 100644
index 00000000..2d74ab7b
Binary files /dev/null and b/docs/segments/images/segment_contacts_stat_cards.png differ
diff --git a/docs/segments/manage_segments.rst b/docs/segments/manage_segments.rst
index e17c8649..2e08ee9b 100644
--- a/docs/segments/manage_segments.rst
+++ b/docs/segments/manage_segments.rst
@@ -53,6 +53,28 @@ When viewing all Segments, the **# contacts** column shows the number of Contact
 
 .. vale off
 
+Viewing a Segment's statistics
+******************************
+
+.. vale on
+
+When you open a Segment, the detail view shows a row of stat cards that summarize its membership. Each card shows a count and links to the Contacts interface filtered to those Contacts.
+
+.. image:: images/segment_contacts_stat_cards.png
+   :width: 700
+   :alt: Segment detail view showing four stat cards - Total, Active, Manually added, and Filter added - each with a count of Contacts.
+
+.. vale off
+
+* **Total contacts** - All Contacts in the Segment.
+* **Active contacts** - Contacts in the Segment who aren't marked as Do Not Contact.
+* **Manually added contacts** - Contacts added manually to the Segment. This includes Contacts a Mautic User added directly and Contacts who subscribed through the Preference Center.
+* **Filter added contacts** - Contacts that Mautic added automatically based on the Segment's filter rules. This card appears only for Segments that have filters configured.
+
+.. vale on
+
+.. vale off
+
 Exporting Contacts of a Segment
 *******************************