diff --git a/Makefile b/Makefile
index 04dda536..b210ae3f 100644
--- a/Makefile
+++ b/Makefile
@@ -50,8 +50,9 @@ MODULE_DOCS := app ast base64 bytevector config crypto/md5 crypto/rsa \
 	crypto/sha2 diff disasm doc edit-distance equiv filesystem generic \
 	heap-stats io iset/base iset/constructors iset/iterators json loop \
 	match math/prime memoize mime modules net net/http-server net/servlet \
-	parse pathname process repl scribble string stty sxml system temp-file \
-	test time trace type-inference uri weak monad/environment crypto/sha2
+	optional parse pathname process repl scribble string stty sxml system \
+	temp-file test time trace type-inference uri weak monad/environment \
+	crypto/sha2
 
 IMAGE_FILES = lib/chibi.img lib/red.img lib/snow.img
 
diff --git a/doc/chibi.scrbl b/doc/chibi.scrbl
index ec581cb1..2593ead5 100755
--- a/doc/chibi.scrbl
+++ b/doc/chibi.scrbl
@@ -1343,6 +1343,8 @@ namespace.
 
 \item{\hyperlink["lib/chibi/net/servlet.html"]{(chibi net servlet) - HTTP servlets for http-server or CGI}}
 
+\item{\hyperlink["lib/chibi/optional.html"]{(chibi optional) - Syntax to support optional and named keyword arguments}}
+
 \item{\hyperlink["lib/chibi/parse.html"]{(chibi parse) - Parser combinators with convenient syntax}}
 
 \item{\hyperlink["lib/chibi/pathname.html"]{(chibi pathname) - Utilities to decompose and manipulate pathnames}}