diff --git a/.gitignore b/.gitignore
index e26688e..bca5bc6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *.swo
 *.swp
+*.swn
 
 /build/
 local.mak
diff --git a/include/mhe/promise/.promise.hpp.swn b/include/mhe/promise/.promise.hpp.swn
deleted file mode 100644
index 1868c0f..0000000
Binary files a/include/mhe/promise/.promise.hpp.swn and /dev/null differ