Be more explicit about the meaning of "remove prefix" in Gnus search

* doc/misc/gnus.texi (Search Engines): It's easy to get confused about
what we're removing and why.

diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 306d66de64e4e9ba67c4e5b1dba637d626066288..6e8de0368c04efd8bdf2223cf3c2810f3fcc1108 100644 (file)
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -21674,7 +21674,9 @@ engine.
 @item remove-prefix
 The directory part to be removed from the filenames returned by the
 search query.  This absolute path should include everything up to the
-top level of the message store.
+top level of the message store.  Note that this is the path to the
+location of the actual messages, not to the search engine's indexes
+(nor, in the case of Mairix, to its symlink directories).
 
 @item switches
 Additional command-line switches to be fed to the search program.  The