diff --git a/src/schema_formats/XML/GMP.xml.in b/src/schema_formats/XML/GMP.xml.in
index 91f7ea959..356c18f55 100644
--- a/src/schema_formats/XML/GMP.xml.in
+++ b/src/schema_formats/XML/GMP.xml.in
@@ -13304,6 +13304,7 @@ END:VCALENDAR
       </attrib>
       <attrib>
         <name>details</name>
+        <summary>Whether to include full details</summary>
         <type>boolean</type>
       </attrib>
       <attrib>
@@ -14225,6 +14226,7 @@ END:VCALENDAR
       </attrib>
       <attrib>
         <name>details</name>
+        <summary>Whether to include full details</summary>
         <type>boolean</type>
       </attrib>
       <attrib>