diff --git a/app/aws/s3.py b/app/aws/s3.py
index 4272b2887..657311016 100644
--- a/app/aws/s3.py
+++ b/app/aws/s3.py
@@ -164,6 +164,12 @@ def read_s3_file(bucket_name, object_key, s3res):
                 .read()
                 .decode("utf-8")
             )
+            # TODO we probably don't need this phone number check anymore.
+            # Originally, there were csv uploads that were not valid
+            # for messaging sending.  They may have been experimental, or
+            # they may have not been caught by validation.  When we're sure
+            # all csv files have a phone number column, we can remove the if.
+            # We are essentially just making sure this object looks like a job.
             if "phone number" in object.lower():
                 set_job_cache(job_cache, job_id, object)
                 set_job_cache(job_cache, f"{job_id}_phones", extract_phones(object))