===================================================================
@@ -290,7 +290,7 @@
The authoritative manual on Objective-C 2.0 is available from Apple:
@itemize
@item
-@uref{https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html}
+@uref{https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html}
@end itemize
For more information concerning the history of Objective-C that is