Add parameter to CI_Input::user_agent()
diff --git a/user_guide_src/source/libraries/input.rst b/user_guide_src/source/libraries/input.rst
index 6162a66..f9dbf16 100644
--- a/user_guide_src/source/libraries/input.rst
+++ b/user_guide_src/source/libraries/input.rst
@@ -326,9 +326,10 @@
Accepts an optional second string parameter of 'ipv4' or 'ipv6' to specify
an IP format. The default checks for both formats.
- .. method:: user_agent()
+ .. method:: user_agent([$xss_clean = NULL])
:returns: User agent string or NULL if not set
+ :param bool $xss_clean: Whether to apply XSS filtering
:rtype: mixed
Returns the user agent string (web browser) being used by the current user,