Make CI_Email::set_alt_message() parameter mandatory (optional doesn't make sense)
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 0344b78..a6fabe1 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -331,7 +331,7 @@
- Added option to store raw values instead of CI-formatted ones (APC, Memcache).
- Added atomic increment/decrement feature via ``increment()``, ``decrement()``.
- - :doc:`Email Library <libraries/email>` changes include:
+ - :doc:`E-mail Library <libraries/email>` changes include:
- Added a custom filename parameter to ``attach()`` as ``$this->email->attach($filename, $disposition, $newname)``.
- Added possibility to send attachment as buffer string in ``attach()`` as ``$this->email->attach($buffer, $disposition, $newname, $mime)``.