Update Outerloop test instructions

1 files changed, 7 insertions, 1 deletions

diff --git a/Documentation/building/windows-instructions.md b/Documentation/building/windows-instructions.md
index 9292c92760..ef23a32f9c 100644
--- a/Documentation/building/windows-instructions.md
+++ b/Documentation/building/windows-instructions.md
@@ -77,7 +77,13 @@ Tests participate in the incremental build.  This means that if tests have alrea
 The tests can also be filtered based on xunit trait attributes defined in [`xunit.netcore.extensions`](https://github.com/dotnet/buildtools/tree/master/src/xunit.netcore.extensions). These attributes are to be specified over the test method. The available attributes are:
 
 _**`OuterLoop`:**_
-This attribute applies the 'outerloop' category; to run outerloop tests, use the following commandline
+Tests marked as ```Outerloop``` either take longer to execute than normal tests or cover extra cases not in the regular tests. These tests are excluded by default when testing through msbuild but can be enabled manually by adding the  ```/p:Outerloop=true``` property e.g. 
+
+```cmd
+build.cmd *.csproj /p:Outerloop=true
+```
+
+To run <b>only</b> the Outerloop tests, use the following command:
 ```cmd
 xunit.console.netcore.exe *.dll -trait category=outerloop
 build.cmd *.csproj /p:WithCategories=OuterLoop