Fix bug #7777 with documentation of directory-abbrev-alist.

 lisp/files.el (directory-abbrev-alist): Doc fix.
 doc/lispref/files.texi (Directory Names): Explain why FROM in
 directory-abbrev-alist should begin with \`.

1 files changed, 4 insertions, 1 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 690caf13960..ab027b507f6 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -56,7 +56,10 @@ when it has unsaved changes."
 A list of elements of the form (FROM . TO), each meaning to replace
 FROM with TO when it appears in a directory name.  This replacement is
 done when setting up the default directory of a newly visited file.
-*Every* FROM string should start with \"\\\\`\".
+
+FROM is matched against directory names anchored at the first
+character, so it should start with a \"\\\\`\", or, if directory
+names cannot have embedded newlines, with a \"^\".
 
 FROM and TO should be equivalent names, which refer to the
 same directory.  Do not use `~' in the TO strings;