diff --git a/main.cpp b/main.cpp
index 9c60a6c..53cc8f1 100755
--- a/main.cpp
+++ b/main.cpp
@@ -40,7 +40,8 @@ namespace route {
 	std::filesystem::path postsDir("posts");
 	std::vector<std::future<std::string>> futures;
 	for (auto const& entry : std::filesystem::directory_iterator{postsDir}) {
-	    futures.emplace_back(std::async(std::launch::async, process_file, entry.path()));
+	    if (entry.path().extension() == ".md")
+		futures.emplace_back(std::async(std::launch::async, process_file, entry.path()));
 	}