diff --git a/src/api/route-services/experiment.js b/src/api/route-services/experiment.js
index 74745dbea..c6d406740 100644
--- a/src/api/route-services/experiment.js
+++ b/src/api/route-services/experiment.js
@@ -241,6 +241,8 @@ class ExperimentService {
   }
 
   async patchCellSets(experimentId, patch) {
+    logger.log(`PATCH cell sets in s3 for experiment ${experimentId}`);
+
     const cellSetsObject = await this.getCellSets(experimentId);
     const { cellSets: cellSetsList } = cellSetsObject;