diff --git a/Button-functions.md b/Button-functions.md
index ad48268..5a4e835 100644
--- a/Button-functions.md
+++ b/Button-functions.md
@@ -74,9 +74,9 @@ If FM radio reception is active, it stops when a signal is received on a Frequen
 # External key/microphone
 ## `PTT` 
 * Push To Talk button.
-* The 'PTT on the external microphone' works differently than the 'internal PTT' (side) button.
-> * - When pressing the PTT, the TX waits until no RX signal is received (observed with Internal PCB revision V1.4 and OK with V1.6). Works well when pressing the 'internal PTT'.
-> * - A DTMF-tone (key-press) or 1750Hz-tone (side button) is cut off within a second. Works well when pressing the 'internal PTT'.
+* The `PTT on the external microphone` works differently than the `internal PTT` (side) button.
+> * - When pressing the PTT, the TX waits until no RX signal is received (_observed with Radio-PCB revision V1.4 and OK with V1.6_). Works well when pressing the _internal PTT_.
+> * - A DTMF-tone (`key-press`) or 1750Hz-tone (`function button`) is cut off within a second. Works well when pressing the _internal PTT_.
 
 # Custom button functions
 3 buttons can have its function changed. To change the function go to menu: