diff --git a/docs/conf.py b/docs/conf.py
index 0066031..a42dcb2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -38,6 +38,7 @@
     'sphinx.ext.intersphinx',
     'sphinx.ext.viewcode',
     'cryptography-docs',
+    'sphinxcontrib.spelling',
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
new file mode 100644
index 0000000..97356c2
--- /dev/null
+++ b/docs/spelling_wordlist.txt
@@ -0,0 +1,28 @@
+backend
+backends
+boolean
+ciphertext
+committer
+crypto
+cryptographic
+cryptographically
+decrypt
+decrypted
+decrypting
+fernet
+hazmat
+indistinguishability
+introspectability
+invariants
+pickleable
+plaintext
+testability
+unencrypted
+unpadded
+unpadding
+Backends
+Blowfish
+Changelog
+Docstrings
+Fernet
+Schneier
diff --git a/tox.ini b/tox.ini
index ce2f539..9cd0699 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,7 @@
     sphinx-build -W -b latex -d {envtmpdir}/doctrees docs docs/_build/latex
     sphinx-build -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html
     sphinx-build -W -b linkcheck docs docs/_build/html
+    sphinx-build -W -b spelling docs docs/_build/html
 
 # Temporarily disable coverage on pypy because of performance problems with
 # coverage.py on pypy.