Fix issue #1340 [ci skip]
diff --git a/user_guide_src/source/libraries/file_uploading.rst b/user_guide_src/source/libraries/file_uploading.rst
index 65cd5c7..1698dcb 100644
--- a/user_guide_src/source/libraries/file_uploading.rst
+++ b/user_guide_src/source/libraries/file_uploading.rst
@@ -197,6 +197,7 @@
Separate multiple types with a pipe.
**file_name** None Desired file name If set CodeIgniter will rename the uploaded file to this name. The
extension provided in the file name must also be an allowed file type.
+ If no extension is provided in the original file_name will be used.
**overwrite** FALSE TRUE/FALSE (boolean) If set to true, if a file with the same name as the one you are
uploading exists, it will be overwritten. If set to false, a number will
be appended to the filename if another with the same name exists.