diff --git a/src/zanshin/app/org.kde.zanshin.appdata.xml b/src/zanshin/app/org.kde.zanshin.appdata.xml
--- a/src/zanshin/app/org.kde.zanshin.appdata.xml
+++ b/src/zanshin/app/org.kde.zanshin.appdata.xml
@@ -169,6 +169,7 @@
   <url type="bugtracker">https://bugs.kde.org/enter_bug.cgi?format=guided&amp;product=zanshin</url>
   <screenshots>
     <screenshot type="default">
+      <caption>Zanshin main window</caption>
       <image>https://cdn.kde.org/screenshots/zanshin/zanshin.png</image>
     </screenshot>
   </screenshots>