Fixed typo
diff --git a/user_guide_src/source/installation/upgrade_300.rst b/user_guide_src/source/installation/upgrade_300.rst
index 2e9ee4e..549adfe 100644
--- a/user_guide_src/source/installation/upgrade_300.rst
+++ b/user_guide_src/source/installation/upgrade_300.rst
@@ -231,7 +231,7 @@
a certain set of "programmatic characters" to HTML entities when they
are encountered in a URI segment.
-This was aimed at providing some automatic XSS prodection, in addition
+This was aimed at providing some automatic XSS protection, in addition
to the ``$config['permitted_uri_chars']`` setting, but has proven to be
problematic and is now removed in CodeIgniter 3.0.