diff --git a/docs/extensions/info-xml.md b/docs/extensions/info-xml.md
index 26e64eb88ae2ca26823791f18e5fd132e731818c..f6092d42fb1ee992e6f2f9d14fb20af21e310b94 100644
--- a/docs/extensions/info-xml.md
+++ b/docs/extensions/info-xml.md
@@ -314,7 +314,7 @@ Elements acceptable within `<urls>`
 ### `<ver>` {:#ver}
 
 * Containing element: [`<compatibility>`](#compatibility)
-* Description: a version of CiviCRM with which this extension is compatible
+* Description: a version of CiviCRM with which this extension is compatible; expressed as two digits
 * Contains: text
 * Example: `4.7`