diff --git a/include/ChangeLog b/include/ChangeLog
index b34f2fd959b..0d0ebf3d287 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2000-03-01  H.J. Lu  <hjl@gnu.org>
+
+	* bfdlink.h (bfd_link_callbacks): Add a boolean arg to
+	the undefined_symbol callback.
+
 2000-02-23  Linas Vepstas <linas@linas.org>
 
 	* dis-asm.h (print_insn_i370): Declare.
diff --git a/include/bfdlink.h b/include/bfdlink.h
index f7f113c37e3..bb827a35f04 100644
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@@ -329,10 +329,13 @@ struct bfd_link_callbacks
   /* A function which is called when a relocation is attempted against
      an undefined symbol.  NAME is the symbol which is undefined.
      ABFD, SECTION and ADDRESS identify the location from which the
-     reference is made.  In some cases SECTION may be NULL.  */
+     reference is made. FATAL indicates whether an undefined symbol is
+     a fatal error or not. In some cases SECTION may be NULL.  */
   boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *,
 				       const char *name, bfd *abfd,
-				       asection *section, bfd_vma address));
+				       asection *section,
+				       bfd_vma address,
+				       boolean fatal));
   /* A function which is called when a reloc overflow occurs.  NAME is
      the name of the symbol or section the reloc is against,
      RELOC_NAME is the name of the relocation, and ADDEND is any