include explanation of Rule Concatenation on Existing Rule

Rules.md

@@ -175,6 +175,22 @@ Sets Mem2 to the current time (minutes elapsed since midnight)
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 After a Wi-Fi reconnect event publish to stat/topic/BLACKOUT a payload containing timestamps of when the Wi-Fi disconnected in *From:* and when the Wi-Fi connected in *To:*.
 
+
+**Concatenating a rule on existing rule**
+  
+Use of wildcard `+`
+
+Existing Rule1: `on Rules#Timer=1 do Mem2 %time% endon`
+
+To Concatenate: `on button1#state do POWER TOGGLE endon`,
+
+                 `Rule1 + on button1#state do POWER TOGGLE endon`
+
+Resulting Rule1: `on Rules#Timer=1 do Mem2 %time% endon on button1#state do POWER TOGGLE endon`
+
+
+
+
 **For examples of various rules use [Rule Cookbook](Rule-Cookbook).**
 
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