diff --git a/README.md b/README.md
index a8d283b..dd05e38 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Building
 
 The build system uses the BSD flavor of make.  This is the default
 make on the BSDs, originally called pmake, but also available as bsdmake
-for MacOSX, and likely other operating systems as well.
+for MacOSX, and available as [bmake](https://crufty.net/help/sjg/bmake.html).
 
 It also depends upon ARM's [GNU Arm Embedded
 Toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm),