+.I "MONO_XMLSERIALIZER_THS"
+Controls the threshold for the XmlSerializer to produce a custom
+serializer for a given class instead of using the Reflection-based
+interpreter. The possible values are `no' to disable the use of a
+custom serializer or a number to indicate when the XmlSerializer
+should start serializing. The default value is 50, which means that
+the a custom serializer will be produced on the 50th use.
+.SH ENVIRONMENT VARIABLES FOR DEBUGGING
+.TP
+.I "MONO_ASPNET_NODELETE"
+If set to any value, temporary source files generated by ASP.NET support
+classes will not be removed. They will be kept in the user's temporary
+directory.
+.TP
+.I "MONO_LOG_LEVEL"
+The logging level, possible values are `error', `critical', `warning',
+`message', `info' and `debug'. See the DEBUGGING section for more
+details.
+.TP
+.I "MONO_LOG_MASK"
+Controls the domain of the Mono runtime that logging will apply to.
+If set, the log mask is changed to the set value. Possible values are
+"asm" (assembly loader), "type", "dll" (native library loader), "gc"
+(garbage collector), "cfg" (config file loader), "aot" (precompiler) and "all".
+The default value is "all". Changing the mask value allows you to display only
+messages for a certain component. You can use multiple masks by comma
+separating them. For example to see config file messages and assembly loader
+messages set you mask to "asm,cfg".
+.TP