diff --git a/core/threads/threads-docs.factor b/core/threads/threads-docs.factor
index 3f9ff54ac8..7d8791d493 100755
--- a/core/threads/threads-docs.factor
+++ b/core/threads/threads-docs.factor
@@ -116,10 +116,13 @@ $nl
 "Other threads may interrupt the sleep by calling " { $link interrupt } "." } ;
 
 HELP: sleep
-{ $values { "ms" "a non-negative integer" } }
-{ $description "Suspends the current thread for " { $snippet "ms" } " milliseconds."
+{ $values { "dt" "a duration" } }
+{ $description "Suspends the current thread for the given duration."
 $nl
-"Other threads may interrupt the sleep by calling " { $link interrupt } "." } ;
+"Other threads may interrupt the sleep by calling " { $link interrupt } "." }
+{ $examples
+    { $code "USING: threads calendar ;" "10 seconds sleep" }
+} ;
 
 HELP: interrupt
 { $values { "thread" thread } }
diff --git a/core/threads/threads.factor b/core/threads/threads.factor
index 8b89cd5732..cbca7ac029 100755
--- a/core/threads/threads.factor
+++ b/core/threads/threads.factor
@@ -93,7 +93,7 @@ PRIVATE>
 
 <PRIVATE
 
-: schedule-sleep ( thread ms -- )
+: schedule-sleep ( thread dt -- )
     >r check-registered dup r> sleep-queue heap-push*
     >>sleep-entry drop ;
 
@@ -153,7 +153,7 @@ M: integer sleep-until
 M: f sleep-until
     drop [ drop ] "interrupt" suspend drop ;
 
-GENERIC: sleep ( ms -- )
+GENERIC: sleep ( dt -- )
 
 M: real sleep
     millis + >integer sleep-until ;
diff --git a/extra/help/tutorial/tutorial.factor b/extra/help/tutorial/tutorial.factor
index fffcda69b6..cafa758c7e 100755
--- a/extra/help/tutorial/tutorial.factor
+++ b/extra/help/tutorial/tutorial.factor
@@ -135,7 +135,7 @@ $nl
 { $code "[ Letter? ] filter >lower" }
 "This code starts with a string on the stack, removes non-alphabetical characters, and converts the result to lower case, leaving a new string on the stack. We put this code in a new word, and add the new word to " { $snippet "palindrome.factor" } ":"
 { $code ": normalize ( str -- newstr ) [ Letter? ] filter >lower ;" }
-"You will need to add " { $vocab-link "unicode.categories" } " to the vocabulary search path, so that " { $link Letter? } " can be used in the source file."
+"You will need to add " { $vocab-link "unicode.case" } " and " { $vocab-link "unicode.categories" } " to the vocabulary search path, so that " { $link Letter? } " can be used in the source file."
 $nl
 "We modify " { $snippet "palindrome?" } " to first apply " { $snippet "normalize" } " to its input:"
 { $code ": palindrome? ( str -- ? ) normalize dup reverse = ;" }
diff --git a/extra/morse/morse-docs.factor b/extra/morse/morse-docs.factor
index f31b741c85..e35967d3e9 100644
--- a/extra/morse/morse-docs.factor
+++ b/extra/morse/morse-docs.factor
@@ -24,6 +24,10 @@ HELP: morse>
 { $description "Translates morse code into ASCII text" }
 { $see-also >morse morse>ch } ;
 
-HELP: play-as-morse
+HELP: play-as-morse*
 { $values { "str" "A string of ascii characters which can be translated into morse code" } { "unit-length" "The length of a dot" } }
 { $description "Plays a string as morse code" } ;
+
+HELP: play-as-morse
+{ $values { "str" "A string of ascii characters which can be translated into morse code" } }
+{ $description "Plays a string as morse code" } ;