Add .Net4.5 requirement

index.md

@@ -39,8 +39,8 @@ Not sure whether you need 32-bit or 64-bit? Can’t remember that command yo
 
 # Installs in seconds
 
-Make sure [Powershell 3](https://www.microsoft.com/en-us/download/details.aspx?id=34595) (or later)
-is installed, then run:
+Make sure [Powershell 3](https://www.microsoft.com/en-us/download/details.aspx?id=34595) (or later) 
+and .Net 4.5 (or later) are installed. Then run:
 
 ```powershell
 iex (new-object net.webclient).downloadstring('https://get.scoop.sh')