diff --git a/doc/bugs/concurrent_drop--from_presence_checking_failures.mdwn b/doc/bugs/concurrent_drop--from_presence_checking_failures.mdwn
index 66fe488962..44d73b1dfc 100644
--- a/doc/bugs/concurrent_drop--from_presence_checking_failures.mdwn
+++ b/doc/bugs/concurrent_drop--from_presence_checking_failures.mdwn
@@ -260,7 +260,7 @@ S no longer had the copy it expected. But, this is not actually
 a problem, because the copy moved to R2 and so still exists. 
 
 So, this is ok!
-<pre>
+</pre>
 
 Case 2: