What Charles signed

Clause 2 of the Secret Treaty of Dover, 1670:

The King of England, being convinced of the truth of the Roman Catholic religion, is resolved to declare it, and to reconcile himself with the Church of Rome as soon as the state of his country's affairs permit... But as there are always unquiet spirits who mask their designs under the guise of religion... (he) will avail himself of the assistance of the King of France, who, on his part, promises to pay to the King of England the sum of two million livres tournois... In addition, the King of France undertakes to provide, at his own expense, six thousand troops for the execution of the design.

What Charles told Parliament

I cannot conclude without showing the entire confidence I have in you. I know you have heard much of my alliance with France; and I believe it hath been strangely represented to you, as if there were certain secret Articles of dangerous consequence; but I will make no difficulty of letting the Treaties and all the Articles of them, without any the least reserve, to be seen by a small Committee of both Houses, who may report to you the true scope of thme; and I assure you, there is no other Treaty with France, either before or since, not already printed, which shall not be made known.

It was noted at the time that Charles seemed nervous and fumbled with his notes.