diff --git a/docs/api.md b/docs/api.md
index 0f4def8..2df4636 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -841,7 +841,7 @@ var options = {
   ignoreCertificate: false,
   ignoreGpuBlacklist: false,
   enableEs3Apis: false,
-  internalUrls: '.*?', // defaults to URLs on same second-level domain as app
+  internalUrls: '.*?',
   blockExternalUrls: false,
   insecure: false,
   honest: false,
diff --git a/src/cli.ts b/src/cli.ts
index 0409cd6..d27e9e0 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -210,7 +210,7 @@ if (require.main === module) {
     )
     .option(
       '--internal-urls <value>',
-      'regex of URLs to consider "internal"; all other URLs will be opened in an external browser. Default: URLs on same second-level domain as app',
+      'regex of URLs to consider "internal"; all other URLs will be opened in an external browser. Default: URLs sharing the same base domain, once stripped of www.',
     )
     .option(
       '--block-external-urls',