Correction to the IIS installation instructions

editions/tw5.com/tiddlers/saving/Installing TiddlyWiki on Microsoft Internet Information Server.tid

@@ -42,6 +42,7 @@ Microsoft's [[Internet Information Server|https://en.wikipedia.org/wiki/Internet
 # Within it, create a file called `C:\MyStuff\wiki\tiddlers\config-tiddlyweb-host.tid` with the content:
 #> <<example-file "Example config-tiddlyweb-host for IIS">>
 #* (See [[the documentation|https://docs.microsoft.com/en-us/iis/extensions/httpplatformhandler/httpplatformhandler-configuration-reference]] for details of the configuration fields for ~HttpPlatformHandler
+# Execute the command `npm install` within the `C:/MyStuff` directory
 
 ! 4. Setup the application in IIS