diff --git a/src/lib.rs b/src/lib.rs
index 4c6e617..a7fbe1e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -197,4 +197,99 @@ New paragraph",
 
         assert_eq!(doc, doc_ref);
     }
+
+    /// Test "#" headers and their interactions with paragraphs.
+    #[test]
+    fn headers() {
+        let doc = parse(
+            "\
+Paragraph 1
+# Header 1
+Paragraph 2
+## Subheader 1
+Paragraph 3
+
+## Subheader 2
+
+Paragraph 4",
+        );
+        let doc_ref = Document(vec![
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "Paragraph 1".to_string(),
+            }]),
+            Node::Header(Header {
+                label: "Header 1".to_string(),
+                level: 1,
+            }),
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "Paragraph 2".to_string(),
+            }]),
+            Node::Header(Header {
+                label: "Subheader 1".to_string(),
+                level: 2,
+            }),
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "Paragraph 3".to_string(),
+            }]),
+            Node::Header(Header {
+                label: "Subheader 2".to_string(),
+                level: 2,
+            }),
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "Paragraph 4".to_string(),
+            }]),
+        ]);
+
+        assert_eq!(doc, doc_ref);
+    }
+
+    /// Test headers with underlines.
+    #[test]
+    fn alt_headers() {
+        let doc = parse(
+            "\
+Text
+Header
+------
+More text",
+        );
+        let doc_ref = Document(vec![
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "Text".to_string(),
+            }]),
+            Node::Header(Header {
+                label: "Header".to_string(),
+                level: 1,
+            }),
+            Node::Paragraph(vec![StyledText {
+                italic: false,
+                bold: false,
+                underline: false,
+                color: None,
+                text: "More text".to_string(),
+            }]),
+        ]);
+
+        assert_eq!(doc, doc_ref);
+    }
 }