diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b0486f0a23ee16f34e7852a0cb19823c74c3c141..c9e65926881e627a9d4d96d9555106a580a00230 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -51,7 +51,7 @@ code_style:
   tags: [ docker ]
   stage: test
   script:
-    - clang-format-11 --dry-run --verbose $(find ./proto -type f -iname "*.proto") 
+    - clang-format-11 --dry-run --verbose --Werror $(find ./proto -type f -iname "*.proto")
   allow_failure: true
 
 # buf linting
diff --git a/proto/caosdb/info/v1alpha1/main.proto b/proto/caosdb/info/v1alpha1/main.proto
index 59e7b4018d75695406af2b6e91abe8b46755d21b..099ee9a2195ba447393cf55ca57bae2762fb2a09 100644
--- a/proto/caosdb/info/v1alpha1/main.proto
+++ b/proto/caosdb/info/v1alpha1/main.proto
@@ -35,6 +35,7 @@ message VersionInfo {
   uint32 patch = 3;
   // Pre-release version
   string pre_release = 4;
+  // Build metadata
   string build = 5;
 }