diff --git a/ChangeLog b/ChangeLog
index 94354572..8f9cd54b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2009-03-17  Eric Blake  <ebb9@byu.net>
 
+	Remove historical inaccuracy.
+	* doc/autoconf.texi (Portable Shell): Don't perpetuate myth about
+	#!/bin/sh needing a space.
+	Reported by Reuben Thomas.
+
 	Recommend AS_HELP_STRING more prominently.
 	* doc/autoconf.texi (External Software): Reduce mention of
 	hand-written help strings.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index fe852fe2..874d1392 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13691,8 +13691,6 @@ Builtins, , Limitations of Shell Builtins}.
 Some ancient systems have quite
 small limits on the length of the @samp{#!} line; for instance, 32
 bytes (not including the newline) on SunOS 4.
-A few ancient 4.2@acronym{BSD} based systems (such as Dynix circa 1984)
-required a single space between the @samp{#!} and the @samp{/}.
 However, these ancient systems are no longer of practical concern.
 
 The set of external programs you should run in a @command{configure} script