diff --git a/build-toolchain.bash b/build-toolchain.bash
index 339acb2acf..1ec3f849b4 100755
--- a/build-toolchain.bash
+++ b/build-toolchain.bash
@@ -42,6 +42,8 @@ function usage()
 	echo "    --no-ppc                  disable classic PowerPC CFM support"
 	echo "    --no-carbon               disable Carbon CFM support"
 	echo "    --clean-after-build       remove intermediate build files right after building"
+	echo "    --host-cxx-compiler       specify C++ compiler (needed on Mac OS X 10.4)" 
+	echo "    --host-c-compiler         specify C compiler (needed on Mac OS X 10.4)"
 	echo "    --help                    show this help message"
 }