Removed closing PHP tags, replaced with a comment block identifying the end of the file
diff --git a/system/libraries/Hooks.php b/system/libraries/Hooks.php
index a41320c..d7637c3 100644
--- a/system/libraries/Hooks.php
+++ b/system/libraries/Hooks.php
@@ -221,4 +221,6 @@
 }

 

 // END CI_Hooks class

-?>
\ No newline at end of file
+
+/* End of file Hooks.php */
+/* Location: ./system/libraries/Hooks.php */
\ No newline at end of file