diff --git a/README.md b/README.md
index 60d6b94..71ec2ca 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ First locate the compiler's install directory. This is normally the
 You can then build and install the static `libopenlibm.a` archive and the headers.
 
 ```
-% make USEGCC=1 TOOLPREFIX=sh-elf- libdir="$PREFIX" includedir="$PREFIX/include" install-static install-headers
+% make USEGCC=1 TOOLPREFIX=sh-elf- AR=sh-elf-ar CC=sh-elf-gcc libdir="$PREFIX" includedir="$PREFIX/include" install-static install-headers
 ```
 
 ## Using in a Makefile-based add-in