BRE’AKPROMISE. n.s. [from break and promise.] One that
makes a practice of breaking his promise.
[^If you break one jot of your promise,] I will think you the most atheistical
breakpromise, and the most hollow lover. Shakesp. As you like it.
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Dr. Johnson's Dictionary 
So is that note tipped in by the dictionary’s owner? Do we know who this was?
These excerpts are taken from a proof copy of the first edition of the Dictionary held in the Beinecke’s collections, and the annotations and additions are by Samuel Johnson and his helpers. This is actually only one of two proof copies of the Dictionary: the second is in the collections of the British Library. There’s more on this on the “About this copy of the Dictionary” page, on the sidebar of the blog.