diff --git a/conf/checker.conf b/conf/checker.conf
index 6e30963..36b979c 100644
--- a/conf/checker.conf
+++ b/conf/checker.conf
@@ -2,5 +2,9 @@ include = /etc/py-i2phosts/common.conf
 
 log_level = info # debug, info, warning, error, critical
 log_file = /var/log/py-i2phosts/checker.log
+pid_file = /var/run/py-i2phosts/checker.pid
 
 sam_addr = 127.0.0.1:7656
+
+# number of seconds between checks
+check_interval = 43200 #12 hours