diff --git a/doc/img/RTLSDR_plugin.png b/doc/img/RTLSDR_plugin.png
index fc1b1f7df..5ecd56cc4 100644
Binary files a/doc/img/RTLSDR_plugin.png and b/doc/img/RTLSDR_plugin.png differ
diff --git a/doc/img/RTLSDR_plugin.xcf b/doc/img/RTLSDR_plugin.xcf
index ba1c9dad2..0805b73dd 100644
Binary files a/doc/img/RTLSDR_plugin.xcf and b/doc/img/RTLSDR_plugin.xcf differ
diff --git a/plugins/samplesource/rtlsdr/readme.md b/plugins/samplesource/rtlsdr/readme.md
index 755015cef..52e97f8dd 100644
--- a/plugins/samplesource/rtlsdr/readme.md
+++ b/plugins/samplesource/rtlsdr/readme.md
@@ -52,6 +52,10 @@ These buttons control the local DSP auto correction options:
   - **DC**: auto remove DC component
   - **IQ**: auto make I/Q balance. The DC correction must be enabled for this to be effective.
 
+<h3>3a: Antenna bias tee</h3>
+
+Activates or de-activates the antenna bias tee. Works with v3 dongles only it will be simply ignored by others. It actually activates or de-activates GPIO pin 0 that commands bias tee on v3 dongles.
+
 <h3>4: Decimated bandpass center frequency position relative the RTL-SDR center frequency</h3>
 
   - **Cen**: the decimation operation takes place around the RTL-SDR center frequency Fs