diff --git a/Dockerfile.rhel b/Dockerfile.rhel
index 447c96c43eb9d..13d005c02e9e9 100644
--- a/Dockerfile.rhel
+++ b/Dockerfile.rhel
@@ -1,6 +1,8 @@
 FROM registry.svc.ci.openshift.org/openshift/release:rhel-7-release-openshift-4.6 AS build
 # This FROM is RHEL7 based because the CI based hadoop build requires a precise
-# version of protobuf (2.5.0) which seems to be unavilable on RHEL8.
+# version of protobuf (2.5.0) which is unavilable on RHEL8. Downstream
+# production builds use RHEL8 for this builder image since protobuf 2.5.0 is not
+# required and ARM builds require RHEL8.
 
 RUN mkdir /build
 COPY . /build