diff --git a/README.md b/README.md
index 528589a..726acf2 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,19 @@ It is also possible to use (by default enabled in the YSFReflector.ini) a callsi
 
 The result of this check can be overdriven by a whitelist-entry in the blocklist (for example: N0CALL is blocked by default by this expression but could be allowed for special bridging situations).
 
+### Muting Matrix
+Here you see a matrix documenting the behavior of the blocking-lists and configuration of regular expression (RE)-check:
+
+![Muting-Matrix](img/Muting-Matrix.png "Muting-Matrix")
+
+Within this table following descriptions for the cell-values should help understanding the table:
+* X: Any value
+* YES: set and matches with callsign/gateway/ip-address	
+* NO: not set	
+* 1: check via RE enabled, normal operation	
+* 0: check via RE disabled, but passes everything	
+* -1: check via RE disabled, but only pass whitelist	
+
 ### Avoiding Parallel Incomming Transmissions
 There is also a functionality implemented that prohibits parallel transmissions that can happen if two senders transmit at the same time. Here the principle 'first-comes-first-serves' is realized, so the second station in time will just be muted to not disturb the audio.
 
diff --git a/img/Muting-Matrix.png b/img/Muting-Matrix.png
new file mode 100644
index 0000000..dcadfb2
Binary files /dev/null and b/img/Muting-Matrix.png differ