diff --git a/SysadminTips.page b/SysadminTips.page
index 9ddfac0..b56f17d 100644
--- a/SysadminTips.page
+++ b/SysadminTips.page
@@ -1,3 +1,9 @@
+Debug php with strace and php-cgi (especially useful for wp multisites).
+
+```
+HTTP_HOST=www.site.com SCRIPT_FILENAME=index.php REDIRECT_STATUS=CGI SERVER_NAME=www.site.com strace -s 65535 -o /tmp/strace php-cgi -f index.php
+```
+
 ```ps``` with long user fields (here 20).
 
 ```