diff --git a/Button-functions.md b/Button-functions.md
index 88f1830..7b1e981 100644
--- a/Button-functions.md
+++ b/Button-functions.md
@@ -43,6 +43,10 @@ Buttons have functions assigned to them, these functions can be activated by eit
 ## `0 FM`
 * `F+` - turns on FM radio
 * long press - same
+
+If FM radio reception is active, it stops when a signal is received on a VFO/Memory- channel. If that signal stops, the FM radio switches back on after a five seconds.
+Bij pressing side-button-`PTT` you also temporary interrupt FM-reception.
+
 ## `* SCAN`
 * short press - enters DTMF input mode
 * `F+` - turns on CTCSS scanner for current frequency