diff --git a/src/data-loader/toc.ts b/src/data-loader/toc.ts
index 06826cc..117f20e 100644
--- a/src/data-loader/toc.ts
+++ b/src/data-loader/toc.ts
@@ -30,7 +30,7 @@ export function extractHeadings(content: string): TocNode[] {
   const slugger = new Slugger();
 
   for (const line of lines) {
-    const match = line.match(/^(#{1,6})\s+(.+)$/);
+    const match = line.trim().match(/^(#{1,6})\s+(.+)$/);
     if (!match) continue;
 
     const level = match[1].length;