diff --git a/doc/img/NFMMod_plugin.png b/doc/img/NFMMod_plugin.png
index a40e1473f..8a3158490 100644
Binary files a/doc/img/NFMMod_plugin.png and b/doc/img/NFMMod_plugin.png differ
diff --git a/doc/img/NFMMod_plugin.xcf b/doc/img/NFMMod_plugin.xcf
index a7a9d0e84..3d69da6c4 100644
Binary files a/doc/img/NFMMod_plugin.xcf and b/doc/img/NFMMod_plugin.xcf differ
diff --git a/plugins/channeltx/modnfm/readme.md b/plugins/channeltx/modnfm/readme.md
index 83c599859..42bddf112 100644
--- a/plugins/channeltx/modnfm/readme.md
+++ b/plugins/channeltx/modnfm/readme.md
@@ -94,9 +94,11 @@ When you are lost with the RF, AF bandwidths and FM deviation settings you can a
 
 When changing the RF bandwidth the channel spacing selection in the combo box is adjusted to fit within this bandwidth.
 
-<h3>5: Audio frequency bandwidth</h3>
+<h3>5: Audio Filters</h3>
 
-This is the bandwidth in khz of the modulating signal filtered before modulation.
+  - The slider controls the bandwidth in khz of the modulating signal filtered before modulation.
+  - The "P" switch button next activates or de-activates pre-emphasis (fixed 120 &mu;s)
+  - The rightmost button next activates or de-activates 300 Hz highpass filter when no CTCSS nor DCS is active
 
 <h3>6: RF bandwidth</h3>