Update UnitSystem.md

wiki/doc/UnitSystem.md

@@ -174,7 +174,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 |D-SI Identifyer|Description|Examples|D-SI Medal |
 |-:|-:|-:|-:|
 | |Multiplication: simply append one unit to another |\metre\metre|PLATINUM|
-|\tothe{n} | Exponent: following a unit where n is an integer or (+-)0.5 |\metre\tothe{2}, \volt\tothe{-0.5}|PLATINUM|
+|\tothe{n} | Exponent: following a unit where n is an integer or (+-)0.5 |\metre\tothe{2}, \second\tothe{-0.5}|PLATINUM|
 |\per |Division: All units on the left side of the operator devided by all units on its right side |\metre\per\metre|SILVER|
 
 ### References