Index: commandline.doc
==================================================================
--- commandline.doc
+++ commandline.doc
@@ -24,11 +24,12 @@
 -T
   Mode for testing some internal functions of Free Hero Mesh and SDL. You
   probably do not need to use this mode yourself.
 
 -a
-  Autotest levels, ensuring that the provided solution is valid.
+  Autotest levels, ensuring that the provided solution is valid. Lines
+  that don't match /^Level [0-9]+\.*: OK$/ denote errors.
 
 -c
   Only load classes and then terminate. This can be used to test that
   the class definition file does not contain syntax errors, or it can be
   used together with -C, -H, -L, -M to see how it is parsing it.