diff --git a/test/test_unit.sh b/test/test_unit.sh
index 0734c387..5f8f9381 100755
--- a/test/test_unit.sh
+++ b/test/test_unit.sh
@@ -21,6 +21,9 @@ LD_LIBRARY_PATH=../src/libFLAC/.libs:../obj/lib:$LD_LIBRARY_PATH
 export LD_LIBRARY_PATH
 PATH=../src/test_unit:../obj/bin:$PATH
 
+# We use the whole path to test_unit so it can find itself.  It uses it's own
+# binary as a dummy source for creating a test FLAC file so it can work on the
+# metadata.
 if `which test_unit` ; then : ; else
 	echo "ERROR during test_unit" 1>&2
 	exit 1