diff --git a/app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivity.kt b/app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivity.kt
index 0a8f4ba1f..bd27a1898 100644
--- a/app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivity.kt
+++ b/app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivity.kt
@@ -40,6 +40,7 @@ open class ExternalAppBrowserActivity : HomeActivity() {
         components.appStartupTelemetry.onExternalAppBrowserOnCreate(
             safeIntent,
             hasSavedInstanceState,
+            // HomeActivity is init before ExternalAppBrowserActivity so we use that time.
             homeActivityInitTimeStampNanoSeconds,
             rootContainer
         )