README.md in simple_cov-formatter-terminal-1.6.0 vs README.md in simple_cov-formatter-terminal-1.7.0

@@ -102,9 +102,13 @@
 SimpleCov::Formatter::Terminal.config.spec_to_app_file_map = {
   %r{\Aspec/my_special/directory_structure/} => 'my_special/app_directory/',
 }
 ```
 
+### Manually specifying file for which to show coverage
+
+An alternative to using the `spec_to_app_file_map` configuration is to set a `SIMPLECOV_TARGET_FILE` environment variable.
+
 ## Branch coverage
 
 If you enable branch coverage for SimpleCov (via `enable_coverage(:branch)` within your
 `SimpleCov.start` block; read more [here][simple-cov-branch-coverage]), then branch coverage info
 will be included in SimpleCov::Formatter::Terminal's output. Missed branches will be indicated with