diff --git a/doc/config.rst b/doc/config.rst
index 399cc3b84..ed5133672 100644
--- a/doc/config.rst
+++ b/doc/config.rst
@@ -10,7 +10,7 @@ The :term:`configuration directory` must contain a file named :file:`conf.py`.
 This file (containing Python code) is called the "build configuration file" and
 contains all configuration needed to customize Sphinx input and output behavior.
 
-The configuration file if executed as Python code at build time (using
+The configuration file is executed as Python code at build time (using
 :func:`execfile`, and with the current directory set to its containing
 directory), and therefore can execute arbitrarily complex code.  Sphinx then
 reads simple names from the file's namespace as its configuration.