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diff -up less-466/less.nro.filters-man less-466/less.nro
--- less-466/less.nro.filters-man	2014-09-18 14:32:32.124111631 +0200
+++ less-466/less.nro	2014-09-18 14:32:39.548177152 +0200
@@ -1234,6 +1234,18 @@ Similarly, if the first two characters o
 the input pipe is used on standard input as well as other files.
 Again, in this case the dash is not considered to be part of
 the input pipe command.
+There are used following files to set up default preprocessor:
+	/etc/profile.d/
+	/etc/profile.d/less.csh
+These files set up /usr/bin/ as a default filter. An user defined
+filter can be specified in ~/.lessfilter. This file should have an execute bit
+set and accept only one parameter, which represents a filename. If
+the user defined filter process the file, zero should be returned. Otherwise
+~/.lessfilter tries to handle the file.
 There are three types of characters in the input file: