common.proto: add IMAGE_ZIP-related TODO

BUG=None
TEST=regen

Change-Id: I67dea98124094475f7a331165347dfd477691724
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2194324
Tested-by: Sean Abraham <seanabraham@chromium.org>
Auto-Submit: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
diff --git a/src/chromiumos/common.proto b/src/chromiumos/common.proto
index 7610baf..ddf84d4 100644
--- a/src/chromiumos/common.proto
+++ b/src/chromiumos/common.proto
@@ -421,6 +421,10 @@
     enum ArtifactType {
       UNSPECIFIED = 0;
 
+      // TODO(crbug/1034529): once an IMAGE_ZIP value is added here, please
+      // update the build planner (in chromiumos/infra/go), where it says
+      // "use the new output artifacts IMAGE_ZIP"
+
       // TODO(crbug/1034529): BuilderConfig.Artifacts.ArtifactTypes is a common
       // namespace for all services.  We must reserve numbers until that is
       // gone.