diff --git a/help/Prop.md b/help/Prop.md
index 5d77f4d..7c50b5f 100644
--- a/help/Prop.md
+++ b/help/Prop.md
@@ -2,6 +2,7 @@
 See also:
 * <a href="https://github.com/xcape-io/ArduinoProps/blob/master/help/ArduinoProps_sketch.md#arduinoprops-sketch" target="_blank">ArduinoProps sketch</a>
 * <a href="PropData.md" target="_blank">PropData</a> class reference
+* <a href="PropAction.md" target="_blank">PropAction</a> class reference
 
 *Prop* (see <a href="https://github.com/xcape-io/ArduinoProps/blob/master/src/Prop.h" target="_blank">`Prop.h`</a>) is an interface (base class) implemented by 3 classes:
 * ***BridgeProp*** for Yun board and Yun shield