diff --git a/docs/BuildingLibcxx.rst b/docs/BuildingLibcxx.rst
index c334269..06f8960 100644
--- a/docs/BuildingLibcxx.rst
+++ b/docs/BuildingLibcxx.rst
@@ -41,7 +41,7 @@
 
    .. warning::
      * Replacing your systems libc++ installation could render the system non-functional.
-     * Mac OS X will not boot without a valid copy of ``libc++.1.dylib`` in ``/usr/lib``.
+     * macOS will not boot without a valid copy of ``libc++.1.dylib`` in ``/usr/lib``.
 
 
 The instructions are for building libc++ on
diff --git a/docs/UsingLibcxx.rst b/docs/UsingLibcxx.rst
index e2af5c6..ef3023e 100644
--- a/docs/UsingLibcxx.rst
+++ b/docs/UsingLibcxx.rst
@@ -15,7 +15,7 @@
     $ clang++ -stdlib=libc++ test.cpp
     $ clang++ -std=c++11 -stdlib=libc++ test.cpp
 
-On OS X and FreeBSD libc++ is the default standard library
+On macOS and FreeBSD libc++ is the default standard library
 and the ``-stdlib=libc++`` is not required.
 
 .. _alternate libcxx:
@@ -34,7 +34,7 @@
 The option ``-Wl,-rpath,<libcxx-install-prefix>/lib`` adds a runtime library
 search path. Meaning that the systems dynamic linker will look for libc++ in
 ``<libcxx-install-prefix>/lib`` whenever the program is run. Alternatively the
-environment variable ``LD_LIBRARY_PATH`` (``DYLD_LIBRARY_PATH`` on OS X) can
+environment variable ``LD_LIBRARY_PATH`` (``DYLD_LIBRARY_PATH`` on macOS) can
 be used to change the dynamic linkers search paths after a program is compiled.
 
 An example of using ``LD_LIBRARY_PATH``:
diff --git a/docs/index.rst b/docs/index.rst
index 0fd3540..933d0fe 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -93,7 +93,7 @@
 ============ ==================== ============ ========================
 OS           Arch                 Compilers    ABI Library
 ============ ==================== ============ ========================
-Mac OS X     i386, x86_64         Clang, GCC   libc++abi
+macOS        i386, x86_64         Clang, GCC   libc++abi
 FreeBSD 10+  i386, x86_64, ARM    Clang, GCC   libcxxrt, libc++abi
 Linux        i386, x86_64         Clang, GCC   libc++abi
 ============ ==================== ============ ========================