diff --git a/labs/xv6.html b/labs/xv6.html
index 7699b06..8dc7786 100644
--- a/labs/xv6.html
+++ b/labs/xv6.html
@@ -215,41 +215,6 @@ initial file system.  You just ran one of them: <tt>ls</tt>.
     to declare an argv.
   </ul>
 
-<h2>System call tracing</h2>
-
-<p>In this exercise you will modify the xv6 kernel to print out a line
-for each system call invocation. It is enough to print the name of the
-system call and the return value; you don't need to print the system
-call arguments.
-
-<p>
-When you're done, you should see output like this when booting
-xv6:
-
-<pre>
-...
-fork -> 2
-exec -> 0
-open -> 3
-close -> 0
-$write -> 1
- write -> 1
-</pre>
-
-<p>
-That's init forking and execing sh, sh making sure only two file descriptors are
-open, and sh writing the $ prompt.  (Note: the output of the shell and the
-system call trace are intermixed, because the shell uses the write syscall to
-print its output.)
-
-<p> Hint: modify the syscall() function in kernel/syscall.c.
-
-<p>Run the programs you wrote in the previous exercises and inspect
-  the system call trace.  Are there many system calls?  Which systems
-  calls correspond to code in the applications you wrote above?
-    
-<p>Optional: print the system call arguments.
-  
 <h2>Optional: modify the shell</h2>
 
 There are endless ways in which the shell could be extended. Here are