diff --git a/extra/concurrency/semaphores/semaphores.factor b/extra/concurrency/semaphores/semaphores.factor
index b2c99ba6e7..e4b07de8a6 100755
--- a/extra/concurrency/semaphores/semaphores.factor
+++ b/extra/concurrency/semaphores/semaphores.factor
@@ -8,7 +8,7 @@ TUPLE: semaphore count threads ;
 
 : <semaphore> ( n -- semaphore )
     dup 0 < [ "Cannot have semaphore with negative count" throw ] when
-    0 <dlist> semaphore construct-boa ;
+    <dlist> semaphore construct-boa ;
 
 : wait-to-acquire ( semaphore timeout -- )
     >r semaphore-threads r> wait ;
diff --git a/extra/help/handbook/handbook.factor b/extra/help/handbook/handbook.factor
index 4bf78ffa80..837d69d59d 100755
--- a/extra/help/handbook/handbook.factor
+++ b/extra/help/handbook/handbook.factor
@@ -84,7 +84,6 @@ USING: concurrency.combinators
 concurrency.messaging
 concurrency.promises
 concurrency.futures
-concurrency.distributed
 concurrency.locks
 concurrency.semaphores
 concurrency.count-downs
@@ -102,12 +101,12 @@ $nl
 { $subsection "concurrency.promises" }
 { $subsection "concurrency.futures" }
 { $subsection "concurrency.messaging" }
-{ $subsection "concurrency.distributed" }
 "Shared-state abstractions:"
 { $subsection "concurrency.locks" }
 { $subsection "concurrency.semaphores" }
 { $subsection "concurrency.count-downs" }
-{ $subsection "concurrency.exchangers" } ;
+{ $subsection "concurrency.exchangers" }
+"Other concurrency abstractions include " { $vocab-link "concurrency.distributed" } " and " { $vocab-link "channels" } "." ;
 
 ARTICLE: "objects" "Objects"
 "An " { $emphasis "object" } " is any datum which may be identified. All values are objects in Factor. Each object carries type information, and types are checked at runtime; Factor is dynamically typed."