diff --git a/doc/source/user/index.rst b/doc/source/user/index.rst
index 3eca04b..8c7308b 100644
--- a/doc/source/user/index.rst
+++ b/doc/source/user/index.rst
@@ -4,7 +4,7 @@
 This guide is for all users of Zuul.  If you work on a project where
 Zuul is used to drive automation (whether that's testing proposed
 changes, building artifacts, or deploying builds), this guide will
-help you understand the concepts that underly Zuul, and how to
+help you understand the concepts that underlie Zuul, and how to
 configure it to meet your needs.