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diff --git a/ChangeLog b/ChangeLog
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+++ b/ChangeLog
@@ -5,6 +5,19 @@
 	* man/pwd.x, man/echo.x, man/printf.x: Fix typo:
 	s/supercede/supersede/ reported by Andrew Fabbro.
 
+2004-05-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Improve performance of `sort -m' on large files, at the cost of
+	making some contrived examples unsafe.  POSIX allows this
+	optimization.  Performance problem reported by Jonathan Baker in
+	<http://mail.gnu.org/archive/html/bug-coreutils/2004-05/msg00071.html>.
+
+	* src/sort.c (first_same_file): Do not treat input pipes
+	differently from other files.
+	* doc/coreutils.texi (sort invocation): Document that "sort -m -o F"
+	might write F before reading all the input.
+	* NEWS: Likewise.
+
 2004-05-12  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* src/od.c (print_ascii, dump_strings): Use e.g. '\a' rather than