diff --git a/pkg/mark/markdown.go b/pkg/mark/markdown.go
index 98576c0..ddea59f 100644
--- a/pkg/mark/markdown.go
+++ b/pkg/mark/markdown.go
@@ -345,7 +345,7 @@ func DropDocumentLeadingH1(
 
 // ExtractDocumentLeadingH1 will extract leading H1 heading
 func ExtractDocumentLeadingH1(markdown []byte) string {
-	h1 := regexp.MustCompile(`^#[^#]\s*(.*)\s*\n`)
+	h1 := regexp.MustCompile(`#[^#]\s*(.*)\s*\n`)
 	groups := h1.FindSubmatch(markdown)
 	if groups == nil {
 		return ""
diff --git a/pkg/mark/testdata/header.md b/pkg/mark/testdata/header.md
index 9c1d2f0..81a9738 100644
--- a/pkg/mark/testdata/header.md
+++ b/pkg/mark/testdata/header.md
@@ -1,3 +1,4 @@
+
 # a
 ## b
 ### c