-install them based on the section field in their .TH line and their filename
-extension. It also supports translated man pages, by looking for extensions
-like .ll.8 and .ll_LL.8
+install them based on the section field in their .TH line. If you have a
+properly formatted .TH line, your man page will be installed into the right
+directory, with the right name (this includes proper handling of pages
+with a subsection, like "3perl", which are placed in man3, and given an
+extension of ".3perl"). If your .TH line is incorrect or missing, the program
+may guess wrong based on the file extension.
+
+It also supports translated man pages, by looking for extensions
+like .ll.8 and .ll_LL.8, or by use of the --language switch.