diff --git a/doc/img/RTLSDR_plugin.png b/doc/img/RTLSDR_plugin.png
index d90f96a35..a3db93d9c 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 a1981cf43..ad2016c80 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 ebe304077..284219b47 100644
--- a/plugins/samplesource/rtlsdr/readme.md
+++ b/plugins/samplesource/rtlsdr/readme.md
@@ -109,11 +109,15 @@ The I/Q stream from the RTLSDR ADC is downsampled by a power of two before being
 
 Use this checkbox to activate the special RTLSDR direct sampling. This can be used to tune to HF frequencies.
 
-<h3>9: RF bandwidth</h3>
+<h3>9: Offset tuning</h3>
+
+This controls the offset tuning. Some RF frontends like the obsolete E4000 implement this feature and it can seriously reduce the central DC peak without digital correction. This does not work for the R820T and R820T2 that are very popular on which it will produce no effect. However these RF frontends exhibit a central DC peak much smaller than on the E4000 and can be easly corrected digitally via control (3).
+
+<h3>10: RF bandwidth</h3>
 
 This controls the tuner filter bandwidth and can be varied from 350 kHz to 8 MHz. In practice depending on the value this appears to be larger and the filter center is slightly offset above the center frequency. This can still be very useful to eliminate or attenuate large signals outside the device to host I/Q stream passband.
 
-<h3>10: RF gain and AGC</h2>
+<h3>11: RF gain and AGC</h2>
 
 The slider sets RF gain in dB. The values are defined in the RTLSDR device and generally are: 0.0, 0.9, 1.4, 2.7, 3.7, 7.7, 8.7, 12.5, 14.4, 15.7, 16.6, 19.7, 20.7, 22.9, 25.4, 28.0, 29.7, 32.8, 33.8, 36.4, 37.2, 38.6, 40.2, 42.1, 43.4, 43.9, 44.5, 48.0, 49.6
 
diff --git a/plugins/samplesource/rtlsdr/rtlsdrplugin.cpp b/plugins/samplesource/rtlsdr/rtlsdrplugin.cpp
index e4d4c5959..ebde7cd55 100644
--- a/plugins/samplesource/rtlsdr/rtlsdrplugin.cpp
+++ b/plugins/samplesource/rtlsdr/rtlsdrplugin.cpp
@@ -14,7 +14,7 @@
 
 const PluginDescriptor RTLSDRPlugin::m_pluginDescriptor = {
 	QString("RTL-SDR Input"),
-	QString("4.0.6"),
+	QString("4.3.1"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,