# Installing Additional Dictionaries to the Spell Checker

You can purchase additional dictionaries and word lists to use with the IMail Web Messaging Spell Checker. These files must have a file extension of .clx or .tlx.

The .clx file must be placed in the top directory of the host. If you have multiple hosts and want all of them to have access to a dictionary, the .clx file must be placed in the top directory of each host. Doing this will add the dictionary, but Web Messaging users will only see the filename, not the description. For example, if the file name is french.clx, then french.clx will be displayed on the Compose page in the dictionary selection box.