Explain why 'mocha.ui()' is needed'

Author: Thomas Scholtes

lib/cli/watch-run.js

@@ -146,9 +146,9 @@ const resetMocha = mocha => {
   mocha.unloadFiles();
   mocha.suite = mocha.suite.clone();
   mocha.suite.ctx = new Context();
-  // Registers a callback on `mocha.suite` that will expose the globals from the
-  // DSL (e.g. `describe`). This is necessary because we have assigned a new
-  // context to the suite.
+  // Registers a callback on `mocha.suite` that wires new context to the DSL
+  // (e.g. `describe`) that is exposed as globals when the test files are
+  // reloaded.
   mocha.ui(mocha.options.ui);
 };