diff --git a/README.md b/README.md
index 31957c7..6ba48ce 100644
--- a/README.md
+++ b/README.md
@@ -293,9 +293,9 @@ $ sudo /usr/sbin/logrotate -f /etc/logrotate.conf #測試執行log壓縮程序
   compress
   missingok
   notifempty
-  copytruncate
+  create 644 mongodb mongodb
   postrotate
-    [ ! -f /var/lib/mongodb/mongod.lock ] || kill -SIGUSR1 `cat /var/lib/mongodb/mongod.lock`
+    [ ! -f /var/lib/mongodb/mongod.lock ] || kill -USR1 `cat /var/lib/mongodb/mongod.lock`
   endscript
 }