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Update Reference.md

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@ -89,7 +89,7 @@ The following methods are supported:
* 1=double press (SpanButton::DOUBLE)
* 2=long press (SpanButton::LONG)
## *SpanCharacteristic()*
## *SpanCharacteristic(value)*
This is a **base class** from which all HomeSpan Characteristics are derived, and should **not** be directly instantiated. Rather, to create a new Characteristic instantiate one of the HomeSpan Characteristics defined in the [Characteristic](ServiceList.md) namespace.
@ -117,3 +117,10 @@ The following methods are supported:
* `int timeVal()`
* returns time elapsed (in millis) since value of the Characteristic was last updated (whether by `setVal()` or as the result of a successful update request from a HomeKit Controller)
## *SpanRange(int min, int max, int step)*
Creating an instance of this **class** changes the allowable range of values for a Characteristic from its HAP default to instead be between *min* and *max* in increments of *step*.
* instantiated Ranges are added to the HomeSpan HAP Database and associated with the last Characteristic instantiated
* instantiating a Range without first instantiating a Characteristic throws an error during initialization