diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index baa601b44c7..8b554dad550 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-11-08  Mark Mitchell  <mark@codesourcery.com>
+
+	* c-tree.texi (FUNCTION_TYPE): Clarify TYPE_ARG_TYPES for
+	unprototyped C functions with no parameters.
+
 2000-11-08  Jakub Jelinek  <jakub@redhat.com>
 
 	* config/sparc/sparc.h (ASM_OUTPUT_MI_THUNK): Cast DELTA to int
diff --git a/gcc/c-tree.texi b/gcc/c-tree.texi
index 8af1429546b..56a2e25e211 100644
--- a/gcc/c-tree.texi
+++ b/gcc/c-tree.texi
@@ -543,6 +543,10 @@ is the @code{void_type_node}), then functions of this type do not take
 variable arguments.  Otherwise, they do take a variable number of
 arguments.
 
+Note that in C (but not in C++) a function declared like @code{void f()}
+is an unprototyped function taking a variable number of arguments; the
+@code{TYPE_ARG_TYPES} of such a function will be NULL.
+
 @item METHOD_TYPE
 Used to represent the type of a non-static member function.  Like a
 @code{FUNCTION_TYPE}, the return type is given by the @code{TREE_TYPE}.