diff --git a/build/cdc_services/run.sh b/build/cdc_services/run.sh
index 0bea15b77e..3d8dd9ac84 100755
--- a/build/cdc_services/run.sh
+++ b/build/cdc_services/run.sh
@@ -110,6 +110,9 @@ except Exception as e:
     MIXER_ARGS+=("--spanner_graph_info=$SPANNER_CONFIG_YAML" "--use_spanner_graph=true")
 
     # 3. Use mixer custom feature flags
+
+    # Currently we only read custom feature flags when we enable resolving with spanner embeddings.
+    # We will eventually always resolve from spanner embeddings.
     if [[ $RESOLVE_WITH_SPANNER_EMBEDDINGS == "true" ]]; then
         MIXER_ARGS+=('--feature_flags_path=deploy/featureflags/custom.yaml')
     fi