Merge "Add an explicit instruction to enable chrome flag for system Perfetto integration "

docs/quickstart/chrome-tracing.md

diff --git a/docs/quickstart/chrome-tracing.md b/docs/quickstart/chrome-tracing.md
index 4e17172..6786b4d 100644
--- a/docs/quickstart/chrome-tracing.md
+++ b/docs/quickstart/chrome-tracing.md
@@ -4,6 +4,8 @@
 
 > To record traces from Chrome on Android, follow the [instructions for recording Android system traces](/docs/quickstart/android-tracing.md) and enable the Chrome probe.
 
+>> If you are using [user build of Android](https://source.android.com/docs/setup/build/building#lunch), you'll have to enable integration with system Perfetto by switching chrome://flags#enable-perfetto-system-tracing to "Enabled" and restarting Chrome.
+
 ## Recording a trace
 
 1. Navigate to [ui.perfetto.dev](https://ui.perfetto.dev/) and select **"Record new trace"** from the left menu.