diff --git a/samples/bluetooth/mtu_update/README.rst b/samples/bluetooth/mtu_update/README.rst
index 500d5bbbaa8a38..aa9678f0a41615 100644
--- a/samples/bluetooth/mtu_update/README.rst
+++ b/samples/bluetooth/mtu_update/README.rst
@@ -66,7 +66,8 @@ This sample use two applications, two devices need to be setup.
 The first one should be flashed with the central and the second one with the
 peripheral.
 
-The two devices need to be close enough to be able to connect.
+The two devices will connect only if they are close to each other, because of
+RSSI filtering.
 
 Building and Running
 ********************