diff --git a/doc/debian-connect-android.md b/doc/debian-connect-android.md
index 8f7fb32..869aa1b 100644
--- a/doc/debian-connect-android.md
+++ b/doc/debian-connect-android.md
@@ -30,4 +30,8 @@ NOTE:
 NOTE:
 * Make sure the phone is not locked when writing those two commands (or at least the mount ones).
 
+**NOTE**:
+Before calling the following convenience alias,
+make sure the Android device is in 'File Transfer' mode.
+
 * on console write `fp3` or `unfp3`