Nonexistent URL in R_ext/Callbacks.h

There's no RObjectTables.pdf at developer.r-project.org. I included the 
Omegahat URL from the attach help page:

nonexistent

  

Index: src/include/R_ext/Callbacks.h
===================================================================
--- src/include/R_ext/Callbacks.h       (revision 41399)
+++ src/include/R_ext/Callbacks.h       (working copy)
@@ -68,7 +68,7 @@
   separate package and these declarations allow the package to
   interface to the internal R code.

- See http://developer.r-project.org/RObjectTables.pdf.
+ See http://www.omegahat.org/RObjectTables/
   */

  typedef struct  _R_ObjectTable R_ObjectTable;


Jeff