diff --git a/packages/react-scripts/template-typescript/src/serviceWorker.ts b/packages/react-scripts/template-typescript/src/serviceWorker.ts
index 3c897142d9..01eea8797c 100644
--- a/packages/react-scripts/template-typescript/src/serviceWorker.ts
+++ b/packages/react-scripts/template-typescript/src/serviceWorker.ts
@@ -14,7 +14,7 @@ const isLocalhost = Boolean(
   window.location.hostname === 'localhost' ||
     // [::1] is the IPv6 localhost address.
     window.location.hostname === '[::1]' ||
-    // 127.0.0.1/8 is considered localhost for IPv4.
+    // 127.0.0.0/8 are considered localhost for IPv4.
     window.location.hostname.match(
       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
     )
diff --git a/packages/react-scripts/template/src/serviceWorker.js b/packages/react-scripts/template/src/serviceWorker.js
index f8c7e50c20..ceeed83fce 100644
--- a/packages/react-scripts/template/src/serviceWorker.js
+++ b/packages/react-scripts/template/src/serviceWorker.js
@@ -14,7 +14,7 @@ const isLocalhost = Boolean(
   window.location.hostname === 'localhost' ||
     // [::1] is the IPv6 localhost address.
     window.location.hostname === '[::1]' ||
-    // 127.0.0.1/8 is considered localhost for IPv4.
+    // 127.0.0.0/8 are considered localhost for IPv4.
     window.location.hostname.match(
       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
     )