diff --git a/metadata/categories.conf b/metadata/categories.conf
index 88a29369..b1348834 100644
--- a/metadata/categories.conf
+++ b/metadata/categories.conf
@@ -2,6 +2,7 @@ app-admin
 app-arch
 app-benchmarks
 app-crypt
+app-diagram
 app-editors
 app-ergonomics
 app-office