diff --git a/README.md b/README.md
index d412a4d79..5b5215329 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ Since the Mbed Crypto library is a reference implementation of the PSA cryptogra
 
 You need the following tools to build the library with the provided makefiles:
 
-* GNU Make.
+* GNU Make or a build tool that CMake supports.
 * A C99 toolchain (compiler, linker, archiver).
 * Python 2 or Python 3 (either will work) to generate the test code.
 * Perl to run the tests.