diff --git a/docs/conf.py b/docs/conf.py
index b68467f..58e5b9a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,8 +53,8 @@
 #
 # source_encoding = 'utf-8-sig'
 
-# The master toctree document.
-master_doc = "index"
+# The root toctree document.
+root_doc = "index"
 
 # General information about the project.
 project = "google-auth"
@@ -277,13 +277,7 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (
-        master_doc,
-        "google-auth.tex",
-        "google-auth Documentation",
-        "Google, Inc.",
-        "manual",
-    )
+    (root_doc, "google-auth.tex", "google-auth Documentation", "Google, Inc.", "manual")
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -323,7 +317,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "google-auth", "google-auth Documentation", [author], 1)]
+man_pages = [(root_doc, "google-auth", "google-auth Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
 #
@@ -337,7 +331,7 @@
 #  dir menu entry, description, category)
 texinfo_documents = [
     (
-        master_doc,
+        root_doc,
         "google-auth",
         "google-auth Documentation",
         author,