diff --git a/lib/www/server/spec/openapi.yaml b/lib/www/server/spec/openapi.yaml
index a86481f..400124d 100644
--- a/lib/www/server/spec/openapi.yaml
+++ b/lib/www/server/spec/openapi.yaml
@@ -55,6 +55,12 @@ tags:
     -
         name: log
         description: Project events log
+    -
+        name: metadata
+        description: Project items metadata
+    -
+        name: navdata
+        description: Data from navigation headers
 
 components:
     securitySchemes: