diff --git a/doc/source/configuration/encryption-policy.yaml b/doc/source/configuration/encryption-policy.rst
similarity index 100%
rename from doc/source/configuration/encryption-policy.yaml
rename to doc/source/configuration/encryption-policy.rst
diff --git a/test-requirements.txt b/test-requirements.txt
index 8953de5f..7c086efe 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,3 +4,8 @@ bandit>=1.5
 yapf==0.24.0
 sphinx>=1.6.2
 sphinx_rtd_theme==0.2.4
+
+# Imported when the source code is parsed for generating documentation:
+# TODO(felipemonteiro): Move documentation-only requirements into
+# doc/requirements.txt
+falcon==1.2.0
\ No newline at end of file
diff --git a/tox.ini b/tox.ini
index fc1f318d..0a7d35cf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,7 +36,7 @@ deps =
     -r{toxinidir}/test-requirements.txt
 commands =
     rm -rf doc/build
-    sphinx-build -b html doc/source doc/build
+    sphinx-build -W -b html doc/source doc/build
 
 [testenv:fmt]
 deps =