Some explanations of subdir creation

Author: snoyberg

doc/GUIDE.md

@@ -524,6 +524,8 @@ the current one by issueing:
 cueball:~$ stack unpack yackage-0.8.0 --to ~/work
 ```
 
+This will create a `yackage-0.8.0` directory inside `~/work`
+
 ### stack init
 This new directory does not have a `stack.yaml` file, so we need to make one
 first. We could do it by hand, but let's be lazy instead with the `stack init`

src/main/Main.hs

@@ -307,7 +307,7 @@ commandLineHandler currentDir progName isInterpreter = complicatedOptions
                     unpackCmd
                     ((,) <$> some (strArgument $ metavar "PACKAGE")
                          <*> optional (textOption $ long "to" <>
-                                         help "Optional path to unpack the package into"))
+                                         help "Optional path to unpack the package into (will unpack into subdirectory)"))
         addCommand' "update"
                     "Update the package index"
                     updateCmd