diff --git a/files/en-us/web/progressive_web_apps/app_structure/index.html b/files/en-us/web/progressive_web_apps/app_structure/index.html
index 374974b2f30a4df..4a51cd68b7b429b 100644
--- a/files/en-us/web/progressive_web_apps/app_structure/index.html
+++ b/files/en-us/web/progressive_web_apps/app_structure/index.html
@@ -229,7 +229,7 @@ <h3 id="The_service_worker">The service worker</h3>
   e.respondWith((async () =&gt; {
     const r = await caches.match(e.request);
     console.log(`[Service Worker] Fetching resource: ${e.request.url}`);
-    if (r) return r;
+    if (r) { return r; }
     const response = await fetch(e.request);
     const cache = await caches.open(cacheName);
     console.log(`[Service Worker] Caching new resource: ${e.request.url}`);
diff --git a/files/en-us/web/progressive_web_apps/offline_service_workers/index.html b/files/en-us/web/progressive_web_apps/offline_service_workers/index.html
index 1552c95b8f9416b..9d3b882ade5af43 100644
--- a/files/en-us/web/progressive_web_apps/offline_service_workers/index.html
+++ b/files/en-us/web/progressive_web_apps/offline_service_workers/index.html
@@ -136,7 +136,7 @@ <h3 id="Responding_to_fetches">Responding to fetches</h3>
   e.respondWith((async () =&gt; {
     const r = await caches.match(e.request);
     console.log(`[Service Worker] Fetching resource: ${e.request.url}`);
-    if (r) return r;
+    if (r) { return r; }
     const response = await fetch(e.request);
     const cache = await caches.open(cacheName);
     console.log(`[Service Worker] Caching new resource: ${e.request.url}`);
@@ -181,7 +181,7 @@ <h2 id="Clearing_the_cache">Clearing the cache</h2>
   e.waitUntil((async () =&gt; {
     const keyList = await caches.keys();
     await Promise.all(keyList.map((key) =&gt; {
-      if (key === cacheName) return;
+      if (key === cacheName) { return; }
       await caches.delete(key);
     }))
   })());
diff --git a/files/en-us/web/progressive_web_apps/structural_overview/index.html b/files/en-us/web/progressive_web_apps/structural_overview/index.html
index 3ffb6f3f77b4b69..031bfd41e875c4f 100644
--- a/files/en-us/web/progressive_web_apps/structural_overview/index.html
+++ b/files/en-us/web/progressive_web_apps/structural_overview/index.html
@@ -260,7 +260,7 @@ <h3 id="The_service_worker">The service worker</h3>
   e.respondWith((async () =&gt; {
     const r = await caches.match(e.request);
     console.log(`[Service Worker] Fetching resource: ${e.request.url}`);
-    if (r) return r;
+    if (r) { return r; }
     const response = await fetch(e.request);
     const cache = await caches.open(cacheName);
     console.log(`[Service Worker] Caching new resource: ${e.request.url}`);