diff --git a/ChangeLog b/ChangeLog
index 6ac8afb7..a60a9a0a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-04-10  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* doc/autoconf.texi (Particular Types): Don't use AC_CHECK_TYPE.
+	Problem noted by Paul D. Smith.
+
 2006-04-10  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	* doc/autoconf.texi: Remove unused words from word list.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 2ffd16a6..ad2781e9 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -5714,19 +5714,22 @@ Define @code{HAVE_MBSTATE_T} if @code{<wchar.h>} declares the
 @defmac AC_TYPE_MODE_T
 @acindex{TYPE_MODE_T}
 @cvindex mode_t
-Equivalent to @samp{AC_CHECK_TYPE([mode_t], [int])}.
+Define @code{mode_t} to a suitable type, if standard headers do not
+define it.
 @end defmac
 
 @defmac AC_TYPE_OFF_T
 @acindex{TYPE_OFF_T}
 @cvindex off_t
-Equivalent to @samp{AC_CHECK_TYPE([off_t], [long int])}.
+Define @code{off_t} to a suitable type, if standard headers do not
+define it.
 @end defmac
 
 @defmac AC_TYPE_PID_T
 @acindex{TYPE_PID_T}
 @cvindex pid_t
-Equivalent to @samp{AC_CHECK_TYPE([pid_t], [int])}.
+Define @code{pid_t} to a suitable type, if standard headers do not
+define it.
 @end defmac
 
 @defmac AC_TYPE_SIGNAL
@@ -5753,21 +5756,23 @@ hup_handler ()
 @defmac AC_TYPE_SIZE_T
 @acindex{TYPE_SIZE_T}
 @cvindex size_t
-Equivalent to @samp{AC_CHECK_TYPE([size_t], [unsigned int])}.
+Define @code{size_t} to a suitable type, if standard headers do not
+define it.
 @end defmac
 
 @defmac AC_TYPE_SSIZE_T
 @acindex{TYPE_SSIZE_T}
 @cvindex ssize_t
-Equivalent to @samp{AC_CHECK_TYPE([ssize_t], [int])}.
+Define @code{ssize_t} to a suitable type, if standard headers do not
+define it.
 @end defmac
 
 @defmac AC_TYPE_UID_T
 @acindex{TYPE_UID_T}
 @cvindex uid_t
 @cvindex gid_t
-If @code{uid_t} is not defined, define @code{uid_t} to be @code{int} and
-@code{gid_t} to be @code{int}.
+Define @code{uid_t} and @code{gid_t} to suitable types, if standard
+headers do not define them.
 @end defmac
 
 @defmac AC_TYPE_UINT8_T