diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index dc77b7e9a..c8d18ca65 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,15 @@
+2013-05-22  Corinna Vinschen  <vinschen@redhat.com>
+
+	* libc/ctype/isalnum.c: Correct domain of definition to SUSv4 wording.
+	* libc/ctype/isalpha.c: Ditto.
+	* libc/ctype/isblank.c: Ditto.
+	* libc/ctype/iscntrl.c: Ditto.
+	* libc/ctype/isdigit.c: Ditto.
+	* libc/ctype/islower.c: Ditto.
+	* libc/ctype/isprint.c: Ditto.
+	* libc/ctype/ispunct.c: Ditto.
+	* libc/ctype/isxdigit.c: Ditto.
+
 2013-05-22  Corinna Vinschen  <vinschen@redhat.com>
 
 	* libc/include/sys/cdefs.h (_Static_assert): Accommodate gcc >= 4.6.
diff --git a/newlib/libc/ctype/isalnum.c b/newlib/libc/ctype/isalnum.c
index 3fd5f9515..8bc2897c9 100644
--- a/newlib/libc/ctype/isalnum.c
+++ b/newlib/libc/ctype/isalnum.c
@@ -18,7 +18,7 @@ DESCRIPTION
 <<isalnum>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for alphabetic or
 numeric ASCII characters, and <<0>> for other arguments.  It is defined
-for all integer values.
+only if <[c]> is representable as an unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef isalnum>>'.
diff --git a/newlib/libc/ctype/isalpha.c b/newlib/libc/ctype/isalpha.c
index a30ca9e19..d25a8fa27 100644
--- a/newlib/libc/ctype/isalpha.c
+++ b/newlib/libc/ctype/isalpha.c
@@ -16,8 +16,8 @@ TRAD_SYNOPSIS
 DESCRIPTION
 <<isalpha>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero when <[c]> represents an
-alphabetic ASCII character, and 0 otherwise.  It is defined only when
-<<isascii>>(<[c]>) is true or <[c]> is EOF.
+alphabetic ASCII character, and 0 otherwise.  It is defined only if
+<[c]> is representable as an unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef isalpha>>'.
diff --git a/newlib/libc/ctype/isblank.c b/newlib/libc/ctype/isblank.c
index f4d38b95c..896a00768 100644
--- a/newlib/libc/ctype/isblank.c
+++ b/newlib/libc/ctype/isblank.c
@@ -17,7 +17,8 @@ TRAD_SYNOPSIS
 DESCRIPTION
 <<isblank>> is a function which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for blank characters, and 0
-for other characters.
+for other characters.  It is defined only if <[c]> is representable as an
+unsigned char or if <[c]> is EOF.
 
 RETURNS
 <<isblank>> returns non-zero if <[c]> is a blank character.
diff --git a/newlib/libc/ctype/iscntrl.c b/newlib/libc/ctype/iscntrl.c
index a4fdff178..76b0f55de 100644
--- a/newlib/libc/ctype/iscntrl.c
+++ b/newlib/libc/ctype/iscntrl.c
@@ -17,8 +17,8 @@ TRAD_SYNOPSIS
 DESCRIPTION
 <<iscntrl>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for control characters, and 0 
-for other characters.  It is defined only when <<isascii>>(<[c]>) is
-true or <[c]> is EOF. 
+for other characters.  It is defined only if <[c]> is representable as an
+unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef iscntrl>>'.
diff --git a/newlib/libc/ctype/isdigit.c b/newlib/libc/ctype/isdigit.c
index 18383ee45..9db2700b7 100644
--- a/newlib/libc/ctype/isdigit.c
+++ b/newlib/libc/ctype/isdigit.c
@@ -16,8 +16,8 @@ int isdigit(<[c]>);
 DESCRIPTION
 <<isdigit>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for decimal digits, and 0 for
-other characters.  It is defined only when <<isascii>>(<[c]>) is true
-or <[c]> is EOF.
+other characters.  It is defined only if <[c]> is representable as an
+unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef isdigit>>'.
diff --git a/newlib/libc/ctype/islower.c b/newlib/libc/ctype/islower.c
index bef010b8b..ec4309610 100644
--- a/newlib/libc/ctype/islower.c
+++ b/newlib/libc/ctype/islower.c
@@ -18,7 +18,8 @@ DESCRIPTION
 <<islower>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for minuscules
 (lowercase alphabetic characters), and 0 for other characters.
-It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
+It is defined only if <[c]> is representable as an unsigned char or if
+<[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef islower>>'.
diff --git a/newlib/libc/ctype/isprint.c b/newlib/libc/ctype/isprint.c
index 2f317a291..b95aedd16 100644
--- a/newlib/libc/ctype/isprint.c
+++ b/newlib/libc/ctype/isprint.c
@@ -23,7 +23,8 @@ DESCRIPTION
 <<isprint>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for printable
 characters, and 0 for other character arguments. 
-It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
+It is defined only if <[c]> is representable as an unsigned char or if
+<[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining either macro using `<<#undef isprint>>' or `<<#undef isgraph>>'.
diff --git a/newlib/libc/ctype/ispunct.c b/newlib/libc/ctype/ispunct.c
index 9b9c9c0bc..9ca674975 100644
--- a/newlib/libc/ctype/ispunct.c
+++ b/newlib/libc/ctype/ispunct.c
@@ -17,8 +17,8 @@ int ispunct(<[c]>);
 DESCRIPTION
 <<ispunct>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for printable
-punctuation characters, and 0 for other characters.  It is defined
-only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
+punctuation characters, and 0 for other characters.  It is defined only
+if <[c]> is representable as an unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef ispunct>>'.
diff --git a/newlib/libc/ctype/isxdigit.c b/newlib/libc/ctype/isxdigit.c
index 9748eb4b5..314f74e7e 100644
--- a/newlib/libc/ctype/isxdigit.c
+++ b/newlib/libc/ctype/isxdigit.c
@@ -17,8 +17,8 @@ int isxdigit(int <[c]>);
 DESCRIPTION
 <<isxdigit>> is a macro which classifies ASCII integer values by table
 lookup.  It is a predicate returning non-zero for hexadecimal digits,
-and <<0>> for other characters.  It is defined only when
-<<isascii>>(<[c]>) is true or <[c]> is EOF.
+and <<0>> for other characters.  It is defined only if <[c]> is
+representable as an unsigned char or if <[c]> is EOF.
 
 You can use a compiled subroutine instead of the macro definition by
 undefining the macro using `<<#undef isxdigit>>'.