- * winhelp.h - define Windows Help context names. These match up with
- * the \cfg{winhelp-topic} directives in the Halibut source.
+ * winhelp.h - define Windows Help context names.
+ * Each definition has the form "winhelp-topic:halibut-topic", where:
+ * - "winhelp-topic" matches up with the \cfg{winhelp-topic} directives
+ * in the Halibut source, and is used for WinHelp;
+ * - "halibut-topic" matches up with the Halibut keywords in the source,
+ * and is used for HTML Help.