diff --git a/extension/cjk.go b/extension/cjk.go
index 9cf5381..aabafad 100644
--- a/extension/cjk.go
+++ b/extension/cjk.go
@@ -13,12 +13,14 @@ type CJKOption func(*cjk)
 type EastAsianLineBreaksStyle int
 
 const (
+	// EastAsianLineBreaksStyleSimple is a style where soft line breaks are ignored
+	// if both sides of the break are east asian wide characters.
 	EastAsianLineBreaksStyleSimple EastAsianLineBreaksStyle = iota
+	// EastAsianLineBreaksCSS3Draft is a style where soft line breaks are ignored
+	// even if only one side of the break is an east asian wide character.
 	EastAsianLineBreaksCSS3Draft
 )
 
-type EastAsianLineBreaksFunction func()
-
 // WithEastAsianLineBreaks is a functional option that indicates whether softline breaks
 // between east asian wide characters should be ignored.
 func WithEastAsianLineBreaks(style ...EastAsianLineBreaksStyle) CJKOption {
diff --git a/renderer/html/html.go b/renderer/html/html.go
index e2629cc..2da6362 100644
--- a/renderer/html/html.go
+++ b/renderer/html/html.go
@@ -103,10 +103,15 @@ func WithHardWraps() interface {
 // EastAsianLineBreaks is an option name used in WithEastAsianLineBreaks.
 const optEastAsianLineBreaks renderer.OptionName = "EastAsianLineBreaks"
 
+// A EastAsianLineBreaksStyle is a style of east asian line breaks.
 type EastAsianLineBreaksStyle int
 
 const (
+	// EastAsianLineBreaksStyleSimple is a style where soft line breaks are ignored
+	// if both sides of the break are east asian wide characters.
 	EastAsianLineBreaksStyleSimple EastAsianLineBreaksStyle = iota
+	// EastAsianLineBreaksCSS3Draft is a style where soft line breaks are ignored
+	// even if only one side of the break is an east asian wide character.
 	EastAsianLineBreaksCSS3Draft
 )