值得一提的是【zhíde yì tí de shì】

值得一提的是 picks out one fact from what has been said or is about to be said, and flags it as worth the reader's attention. It opens the sentence, followed by a comma and a full clause. The point it introduces is usually a positive or surprising extra, and the register is written or prepared speech.

The 的是 frame

的是 turns the phrase in front into "the thing that is…": 值得一提的是 is literally "what is worth a mention is". The same frame makes other openers.

Mistakes

Without 的是 the phrase can't introduce a clause.

• × 值得一提，他只学了一年中文 → 值得一提的是，他只学了一年中文

值得注意的是 and 需要注意的是 flag a caution rather than an interesting extra. 值得 on its own, "be worth doing", is its own point.