diff --git a/llvm/docs/ProgrammersManual.rst b/llvm/docs/ProgrammersManual.rst
index 75b6239..fe5e661 100644
--- a/llvm/docs/ProgrammersManual.rst
+++ b/llvm/docs/ProgrammersManual.rst
@@ -1372,8 +1372,8 @@
 
 Getting this to work requires a small amount of setup.  On Unix systems
 with X11, install the `graphviz <http://www.graphviz.org>`_ toolkit, and make
-sure 'dot' and 'gv' are in your path.  If you are running on Mac OS X, download
-and install the Mac OS X `Graphviz program
+sure 'dot' and 'gv' are in your path.  If you are running on macOS, download
+and install the macOS `Graphviz program
 <http://www.pixelglow.com/graphviz/>`_ and add
 ``/Applications/Graphviz.app/Contents/MacOS/`` (or wherever you install it) to
 your path. The programs need not be present when configuring, building or