I’m afraid this is misleading.

If I’m not mistaken, you get ECDH*E* *only* if you set `OP_SINGLE_ECDH_USE`.  This function works for the non-PFS ECDH *and* ECDHE though.

I would strongly suggest to both clarify that it works for both *and* to mention the matter from above so people know how to do the right thing.