Update README.md

Building the externals targets isn't a may, but a must.
xamarin · Apr 6, 2017 · f1da9ae · f1da9ae
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Showing 1 changed file with 2 additions and 1 deletion.
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@@ -41,9 +41,10 @@ sh build.sh --target libs
 
 **Windows (experimental support only):**
 
-***NOTE:*** Windows build support is still experimental. You may need to first build the externals target, then open the `GooglePlayServices.sln` in Visual Studio, rebuild it, build the clean target, and then continue on normally building whichever targets you like. This will ensure the appropriate files are downloaded and cached in your user's AppData folder.
+***NOTE:*** Windows build support is still experimental. You need to first build the externals target, then open the `GooglePlayServices.sln` in Visual Studio, rebuild it, build the clean target, and then continue on normally building whichever targets you like. This will ensure the appropriate files are downloaded and cached in your user's AppData folder.
 
 ```
+powershell .\build.ps1 -Target externals
 powershell .\build.ps1 -Target libs
 ```