Added build instruction for loopback test.

diff --git a/qa/loopback/README.txt b/qa/loopback/README.txt
index 5ce8f29cd986097728e778da9d0d267b55c1d79d..5ad028010e2893498eab07c14869d78589e0658e 100644 (file)
--- a/qa/loopback/README.txt
+++ b/qa/loopback/README.txt
@@ -10,6 +10,15 @@ and phase analysers can detect errors in the audio stream.
 
 This test can be run from a script as part of a nightly build and test.
 
+--- How to Build the Loopback Test ---
+
+The loopback test is not normally built by the makefile.
+To build the loopback test, enter:
+
+  ./configure && make loopback
+  
+This will build the "bin/paloopback" executable.
+  
 --- How To Run Test ---
 
 Connect stereo cables from one or more output audio devices to audio input devices.