diff --git a/docs/installing-solidity.rst b/docs/installing-solidity.rst
index 62ea63c6d..9a787b30b 100644
--- a/docs/installing-solidity.rst
+++ b/docs/installing-solidity.rst
@@ -239,7 +239,7 @@ For macOS builds, ensure that you have the latest version of
 `Xcode installed <https://developer.apple.com/xcode/download/>`_.
 This contains the `Clang C++ compiler <https://en.wikipedia.org/wiki/Clang>`_, the
 `Xcode IDE <https://en.wikipedia.org/wiki/Xcode>`_ and other Apple development
-tools which are required for building C++ applications on OS X.
+tools that are required for building C++ applications on OS X.
 If you are installing Xcode for the first time, or have just installed a new
 version then you will need to agree to the license before you can do
 command-line builds: