diff --git a/src/loader/index.ts b/src/loader/index.ts
index 8eec5f3..a69d10b 100644
--- a/src/loader/index.ts
+++ b/src/loader/index.ts
@@ -47,7 +47,7 @@ async function walk<T>(directory: string, visitor: (path: string) => Promise<T[]
     if (fs.statSync(path).isDirectory()) {
       const items = await walk(path, visitor);
       list.push(...items);
-    } else {
+    } else if (path.endsWith("md") || (path.endsWith("MD"))) {      
       const items = await visitor(path);
       list.push(...items);
     }