diff --git a/scripts/custom-docker-build b/scripts/custom-docker-build
index 756239e..d8cdff6 100755
--- a/scripts/custom-docker-build
+++ b/scripts/custom-docker-build
@@ -25,6 +25,9 @@ function print_golang_args() {
     printf -- "--build-arg GOLANG_DOWNLOAD_SHA256=%s " "$GOLANG_DOWNLOAD_SHA256"
 }
 
+# If you add a new minor version here, be sure to check that the
+# ChromeDriver supports this: https://sites.google.com/a/chromium.org/chromedriver/downloads
+# You may need to bump the version in scripts/install-chrome.
 function print_chrome_args() {
     case "$1" in
         60|60.0) CHROME_VERSION=60.0.3112.90-1 ;;