* doc/misc/tramp.texi (New operations): Extend example.

doc/misc/tramp.texi

@@ -6920,6 +6920,7 @@ Then we have the different use cases:
 @end group
 @end lisp
 
+@findex with-parsed-tramp-file-name
 @var{function} is implemented like an ordinary @value{tramp} backend
 handler, see the examples in @code{tramp-<backend>-handle-*} and
 @code{tramp-handle-*}.  It can expect, that the first argument (or
@@ -6927,6 +6928,27 @@ handler, see the examples in @code{tramp-<backend>-handle-*} and
 syntax.  It shall use @value{tramp} internal macros and functions like
 @code{with-parsed-tramp-file-name} and the different cache functions.
 
+@findex tramp-run-real-handler
+If @var{function} must call the original function, this can be done
+via @code{tramp-run-real-handler}.  The implementation of the example
+could look like:
+
+@lisp
+@group
+(defun handle-test-operation (file)
+  (message "Entry handler implementation for %s" file)
+  (tramp-run-real-handler #'test-operation (list file))
+  (message "Exit handler implementation for %s" file))
+@end group
+
+@group
+(test-operation "/ssh::/a/b")
+@result{} "Entry handler implementation for /ssh::/a/b
+   Original implementation for /ssh::/a/b
+   Exit handler implementation for /ssh::/a/b"
+@end group
+@end lisp
+
 If the same @var{function} shall be used for different @value{tramp}
 backends, @code{tramp-add-external-operation} must be called for every
 backend, respectively.