diff --git a/docs/Extras.md b/docs/Extras.md
index c09ad72..f9660c7 100644
--- a/docs/Extras.md
+++ b/docs/Extras.md
@@ -48,6 +48,8 @@ The ESP32 has an on-chip signal-generator peripheral designed to drive an RF or
 
 Creating an instance of this **class** initializes the RF/IR signal generator and specifies the ESP32 *pin* to output the signal.  You may create more than one instance of this class if driving more than one RF/IR transmitter (each connected to different *pin*).
 
+![Pulse Train](images/pulseTrain.png)
+
 The following methods are supported:
 
 (to be continued)