--- a/mysql.rst	Sat Dec 19 17:49:22 2015 +0200
+++ b/mysql.rst	Mon Dec 21 10:31:55 2015 +0200
@@ -56,6 +56,12 @@
 
   MariaDB [mysql]> SHOW GRANTS;
 
+Debugging.
+==========
+
+After error or warning run::
+
   MariaDB [mysql]> SHOW WARNINGS;
   MariaDB [mysql]> SHOW ERRORS;
+  MariaDB [mysql]> show engine innodb status;