Update unix test instructions

diff --git a/Documentation/building/unix-test-instructions.md b/Documentation/building/unix-test-instructions.md
index 49bc59b..9cf7507 100644 (file)
--- a/Documentation/building/unix-test-instructions.md
+++ b/Documentation/building/unix-test-instructions.md
@@ -28,7 +28,7 @@ See runtest.sh usage information:
 
 > `~/coreclr$ tests/runtest.sh --help`
 
-Run tests:
+Run tests (`Debug` may be replaced with `Release` or `Checked`, depending on which Configuration you've built):
 
 > ```bash
 > ~/coreclr$ tests/runtest.sh