diff --git a/doc/img/AISDemod_plugin.png b/doc/img/AISDemod_plugin.png
index cf34b338e..50b5a53cf 100644
Binary files a/doc/img/AISDemod_plugin.png and b/doc/img/AISDemod_plugin.png differ
diff --git a/plugins/channelrx/demodais/readme.md b/plugins/channelrx/demodais/readme.md
index 83c2487ee..d3ab7b662 100644
--- a/plugins/channelrx/demodais/readme.md
+++ b/plugins/channelrx/demodais/readme.md
@@ -48,35 +48,35 @@ This setting scales the output of the FM discriminator, which is used to detect
The threshold for the normalised correlation between the received signal and the preamble (training sequence), from 0 to 1. Being normalised, it does not depend on signal level, so the same setting works for strong and weak signals. Real preambles correlate above 0.9 and the default of 0.6 sits well clear of the noise floor. A lower value may demodulate slightly weaker signals, but increases processor usage sharply, because every threshold crossing starts a sequence detection.
-
7: Find
+7: UDP
-Entering a regular expression in the Find field displays only messages where the source MMSI matches the given regular expression.
+When checked, received messages are forwarded to the specified UDP address (8) and port (9).
-8: Clear Messages from table
-
-Pressing this button clears all messages from the table.
-
-9: UDP
-
-When checked, received messages are forwarded to the specified UDP address (10) and port (11).
-
-10: UDP address
+8: UDP address
IP address of the host to forward received messages to via UDP.
-11: UDP port
+9: UDP port
UDP port number to forward received messages to.
-12: UDP format
+10 UDP format
The format the messages are forwarded via UDP in. This can be either binary (which is useful for SDRangel's PERTester feature) or NMEA (which is useful for 3rd party applications such as OpenCPN).
-13: Use Date and Time from File
+11: Find
+
+Entering a regular expression in the Find field displays only messages where the source MMSI matches the given regular expression.
+
+12: Use Date and Time from File
When checked, if the source device is a File Input device, the date and time used for
packet reception time is taken from the file playback time. Otherwise, the current system clock time is used.
+13: Show / hide Slot Map
+
+When checked shows the slot map (See below).
+
14: Start/stop Logging Messages to .csv File
When checked, writes all received AIS messages to a .csv file.
@@ -89,6 +89,10 @@ Click to specify the name of the .csv file which received AIS messages are logge
Click to specify a previously written .csv log file, which is read and used to update the table.
+17: Clear Messages from table
+
+Pressing this button clears all messages from the table.
+
Slot Map
AIS uses TMDA (Time Division Multiple Access), whereby each one minute frame is divided into 2,250 26.6ms slots.