- * - hotTTR: Expected time-till-refresh for keys that average ~1 hit/second.
- * This should be greater than "ageNew". Keys with higher hit rates will regenerate
- * more often. This is useful when a popular key is changed but the cache purge was
- * delayed or lost. Seldom used keys are rarely affected by this setting, unless an
- * extremely low "hotTTR" value is passed in.
+ * - hotTTR: Expected time-till-refresh (TTR) for keys that average ~1 hit/second (1 Hz).
+ * Keys with a hit rate higher than 1Hz will refresh sooner than this TTR and vise versa.
+ * Such refreshes won't happen until keys are "ageNew" seconds old. The TTR is useful at
+ * reducing the impact of missed cache purges, since the effect of a heavily referenced
+ * key being stale is worse than that of a rarely referenced key. Unlike simply lowering
+ * $ttl, seldomly used keys are largely unaffected by this option, which makes it possible
+ * to have a high hit rate for the "long-tail" of less-used keys.