Document the other consequence of losing your key
diff --git a/docs/contributing.rst b/docs/contributing.rst
index cb9c728..036043f 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -244,7 +244,8 @@
    docs: commands succeeded
    congratulations :)
 
-The HTML documentation index can now be found at ``docs/_build/html/index.html``
+The HTML documentation index can now be found at
+``docs/_build/html/index.html``.
 
 
 .. _`GitHub`: https://github.com/pyca/cryptography