diff --git a/bin/upgrade b/bin/upgrade
index 5f0a645..c4468fe 100755
--- a/bin/upgrade
+++ b/bin/upgrade
@@ -125,6 +125,18 @@ function handle_image_upgrade() {
 
   echo "Upgrading config/version from $IMAGE_VERSION to $SEED_IMAGE_VERSION"
 
+  local docker_compose_override_path="$TOOLKIT_ROOT/config/docker-compose.override.yml"
+  if [ -f "$docker_compose_override_path" ]; then
+     if grep -q -E '^\s*image: sharelatex/sharelatex.*' "$docker_compose_override_path"; then
+        echo "WARNING: you are using a customized docker image, the server may not run on the latest version post upgrade."
+        echo "* If you have followed the guide 'Upgrading TexLive', please remove and recreate the modified image."
+        echo "* Remove the image: 'docker rm sharelatex/sharelatex:with-texlive-full'"
+        echo "* Remove the override file: 'rm config/docker-compose.override.yml'"
+        echo "* Recreate the image by following: https://github.com/overleaf/toolkit/blob/master/doc/ce-upgrading-texlive.md"
+     fi
+  fi
+
+
   ## Offer to stop docker services
   local services_stopped="false"
   if services_up; then