Update HelpMe.md

> 3d[-20--9]

Rolling 3 dice, values ars between -20 and -9.

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@@ -108,6 +108,10 @@ Rolling 4 dice with value between -1 to 1. (Fudge/Fate system)
 
 Rolling 3 dice with 10 faces starting at 0.
 
+> 3d[-20--9]
+
+Rolling 3 dice, values ars between -20 and -9.
+
 ## Arithmetic
 
 Rolisteam Dice Parser is able to compute primary arithmetic operation such as: +, -, /, * and it also manages those operator priority and it can also manage parenthesis.