diff --git a/packages/workbox-core/_private/checkSWFileCacheHeaders.mjs b/packages/workbox-core/_private/checkSWFileCacheHeaders.mjs
index e10c546386..250c3c778e 100644
--- a/packages/workbox-core/_private/checkSWFileCacheHeaders.mjs
+++ b/packages/workbox-core/_private/checkSWFileCacheHeaders.mjs
@@ -24,6 +24,8 @@ const MAX_AGE_REGEX = /max-age\s*=\s*(\d*)/g;
  * to max-age=0 or no-cache.
  *
  * @param {string} cacheControlHeader
+ *
+ * @private
  */
 function showWarning(cacheControlHeader) {
   const docsUrl = 'https://developers.google.com/web/tools/workbox/guides/service-worker-checklist#cache-control_of_your_service_worker_file';
@@ -38,6 +40,8 @@ function showWarning(cacheControlHeader) {
  * Checks for cache-control header on SW file and
  * warns the developer if it exists with a value
  * other than max-age=0 or no-cache.
+ *
+ * @private
  */
 async function checkSWFileCacheHeaders() {
   try {