diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 5d93cf1234a..69d3617d6e8 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-30  Eli Zaretskii  <eliz@gnu.org>
+
+	* snprintf.c: Doc fix.
+
+	* vsnprintf.c: Doc fix.
+
 2009-05-29  Kai Tietz  <kai.tietz@onevision.com>
 
         * pex-win32.c (pex_win32_fdopenr): Set INHERIT to false.
diff --git a/libiberty/snprintf.c b/libiberty/snprintf.c
index f1ba49f980f..36c8e9b3430 100644
--- a/libiberty/snprintf.c
+++ b/libiberty/snprintf.c
@@ -27,13 +27,15 @@ the executable file might be covered by the GNU General Public License. */
 
 @deftypefn Supplemental int snprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, ...)
 
-This function is similar to sprintf, but it will print at most @var{n}
-characters.  On error the return value is -1, otherwise it returns the
-number of characters that would have been printed had @var{n} been
-sufficiently large, regardless of the actual value of @var{n}.  Note
-some pre-C99 system libraries do not implement this correctly so users
-cannot generally rely on the return value if the system version of
-this function is used.
+This function is similar to @code{sprintf}, but it will write to
+@var{buf} at most @code{@var{n}-1} bytes of text, followed by a
+terminating null byte, for a total of @var{n} bytes.
+On error the return value is -1, otherwise it returns the number of
+bytes, not including the terminating null byte, that would have been
+written had @var{n} been sufficiently large, regardless of the actual
+value of @var{n}.  Note some pre-C99 system libraries do not implement
+this correctly so users cannot generally rely on the return value if
+the system version of this function is used.
 
 @end deftypefn
 
diff --git a/libiberty/vsnprintf.c b/libiberty/vsnprintf.c
index 7df5bd88e52..5470df2223b 100644
--- a/libiberty/vsnprintf.c
+++ b/libiberty/vsnprintf.c
@@ -27,13 +27,15 @@ the executable file might be covered by the GNU General Public License. */
 
 @deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, va_list @var{ap})
 
-This function is similar to vsprintf, but it will print at most
-@var{n} characters.  On error the return value is -1, otherwise it
-returns the number of characters that would have been printed had
-@var{n} been sufficiently large, regardless of the actual value of
-@var{n}.  Note some pre-C99 system libraries do not implement this
-correctly so users cannot generally rely on the return value if the
-system version of this function is used.
+This function is similar to @code{vsprintf}, but it will write to
+@var{buf} at most @code{@var{n}-1} bytes of text, followed by a
+terminating null byte, for a total of @var{n} bytes.  On error the
+return value is -1, otherwise it returns the number of characters that
+would have been printed had @var{n} been sufficiently large,
+regardless of the actual value of @var{n}.  Note some pre-C99 system
+libraries do not implement this correctly so users cannot generally
+rely on the return value if the system version of this function is
+used.
 
 @end deftypefn