diff --git a/notes/vps设置.md b/notes/vps设置.md
index 3d86e0e..180fa16 100644
--- a/notes/vps设置.md
+++ b/notes/vps设置.md
@@ -1,3 +1,12 @@
+## swap file
+```
+cd /var
+touch swap.img
+chmod 600 swap.img
+dd if=/dev/zero of=/var/swap.img count=2048 bs=1M
+mkswap swap.img
+swapon swap.img
+```
 
 ## Nginx conf
 ```