README.md in osut-0.2.0 vs README.md in osut-0.2.1

@@ -11,10 +11,11 @@
 ... in a v2.1 [bundled](https://bundler.io) _Measure_ development environment "Gemfile" (or instead as a _gemspec_ dependency), and then run:
 
 ```
 bundle install (or 'bundle update')
 ```
+
 ### Recommended use
 
 As a Ruby module, one can access __osut__ by extending a _Measure_ module or class:
 
 ```
@@ -23,10 +24,10 @@
 module M
   extend OSut
   ...
 end
 ```
-The logger module [oslg](https://github.com/rd2/oslg) is an __osut__ dependency. _Measure_ developers can (optionally) choose to log debug, informative, warning or error messages from within an __osut__-extended module or class, e.g.:
+The logger module [oslg](https://github.com/rd2/oslg) is an __osut__ dependency: DEBUG, WARN and/or ERROR messages may be logged by __osut__, usually as a result of invalid method calls or bad OpenStudio input. _Measure_ developers can (optionally) choose to continue logging messages from within an __osut__-extended module or class, e.g.:
 
 ```
 M.log(OSut::WARN, "Calculated material thickness > 1m")
 ```
 ... and then decide (at any given stage in the _Measure_) what to log to the OpenStudio runner, vs an automatically-generated results report (e.g. for code compliance), vs a bug report.