diff --git a/labs/fs1.html b/labs/fs1.html
index 27a2b1a..45d3e0c 100644
--- a/labs/fs1.html
+++ b/labs/fs1.html
@@ -181,15 +181,16 @@ add <tt>$(QEMUEXTRA)</tt> to the end of <tt>QEMUOPTS</tt>.
 <h2>umount</h2>
 
 <p>Once your kernel passes usertests and test0 of mounttest, implement
-  umount.  The main challenge is mount should fail if the file system
-  is still in use; that is, if there is an inode on the mounted device
-  that has a <tt>ref > 0</tt>.  Furthermore, this test and unmounting
-  should be a atomic operation. (Hint: lock the inode cache.)  Make
-  sure your kernel can pass test1 of mounttest.
+  umount.  The main challenge is that umount of a file system should
+  fail if the file system is still in use; that is, if there is an
+  inode on the mounted device that has a <tt>ref > 0</tt>.
+  Furthermore, this test and unmounting should be an atomic
+  operation. (Hint: lock the inode cache.)  Make sure your kernel
+  passes test1 of mounttest.
 
-<p>Test2 of mounttest stresses <namex> more; if you have done
-    everything right above, your kernel may be able to pass it.  Test3
-    tests concurrent mount/unmounts with file creation.
+<p>Test2 of mounttest stresses <tt>namex</tt> more; if you have done
+    everything right above, your kernel should pass it.  Test3 tests
+    concurrent mount/unmounts with file creation.
 
 <h2>crash safety</h2>