diff --git a/ast/mark.go b/ast/mark.go
index db2ae94..254abb9 100644
--- a/ast/mark.go
+++ b/ast/mark.go
@@ -5,7 +5,7 @@ import (
 	gast "github.com/yuin/goldmark/ast"
 )
 
-// A Mark struct represents a strikethrough of GFM text.
+// A Mark struct represents a mark.
 type Mark struct {
 	gast.BaseInline
 }
@@ -15,7 +15,7 @@ func (n *Mark) Dump(source []byte, level int) {
 	gast.DumpHelper(n, source, level, nil, nil)
 }
 
-// KindMark is a NodeKind of the Strikethrough node.
+// KindMark is a NodeKind of the Mark node.
 var KindMark = gast.NewNodeKind("Mark")
 
 // Kind implements Node.Kind.
@@ -23,7 +23,7 @@ func (n *Mark) Kind() gast.NodeKind {
 	return KindMark
 }
 
-// NewMark returns a new Strikethrough node.
+// NewMark returns a new Mark node.
 func NewMark() *Mark {
 	return &Mark{}
 }