diff --git a/run-build-functions.sh b/run-build-functions.sh
index 1b664d4c..50912a1e 100755
--- a/run-build-functions.sh
+++ b/run-build-functions.sh
@@ -112,6 +112,7 @@ run_yarn() {
   if [[ "${yarn_version%%.*}" -gt "1" ]]
   then
     # The cache-folder flag is deprecated in Yarn 2
+    # Override the environment variable if the user set any.
     export YARN_CACHE_FOLDER="$NETLIFY_BUILD_BASE/.yarn_cache"
   else
     # Remove the cache-folder flag if the user set any.