diff --git a/FAQ.md b/FAQ.md
index 25bae5d5..484e9c50 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -159,6 +159,8 @@ In developer options, enable:
 > **USB debugging (Security settings)**  
 > _Allow granting permissions and simulating input via USB debugging_
 
+Rebooting the device is necessary once this option is set.
+
 [simulating input]: https://github.com/Genymobile/scrcpy/issues/70#issuecomment-373286323
 
 
diff --git a/README.md b/README.md
index 5bafbe2b..ddcc565a 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,8 @@ Make sure you [enabled USB debugging][enable-adb] on your device(s).
 
 On some devices, you also need to enable [an additional option][control] `USB
 debugging (Security Settings)` (this is an item different from `USB debugging`)
-to control it using a keyboard and mouse.
+to control it using a keyboard and mouse. Rebooting the device is necessary once
+this option is set.
 
 [control]: https://github.com/Genymobile/scrcpy/issues/70#issuecomment-373286323