diff --git a/data/org.freedesktop.impl.portal.ScreenCast.xml b/data/org.freedesktop.impl.portal.ScreenCast.xml
index 5f98edef8..d2e34b3d8 100644
--- a/data/org.freedesktop.impl.portal.ScreenCast.xml
+++ b/data/org.freedesktop.impl.portal.ScreenCast.xml
@@ -239,7 +239,7 @@
 
         - ``1``: MONITOR
         - ``2``: WINDOW
-        - ``4``: VIRTUAL
+        - ``4``: VIRTUAL: Virtual monitors
     -->
     <property name="AvailableSourceTypes" type="u" access="read"/>
     <!--
diff --git a/data/org.freedesktop.portal.ScreenCast.xml b/data/org.freedesktop.portal.ScreenCast.xml
index 70adf877f..251fd611c 100644
--- a/data/org.freedesktop.portal.ScreenCast.xml
+++ b/data/org.freedesktop.portal.ScreenCast.xml
@@ -266,7 +266,7 @@
 
         - ``1``: MONITOR
         - ``2``: WINDOW
-        - ``4``: VIRTUAL
+        - ``4``: VIRTUAL: Virtual monitors
     -->
     <property name="AvailableSourceTypes" type="u" access="read"/>
     <!--