If the joint is clear, you don't need to add anything else. Let it dry for about a week though, just to make sure.
If you are paranoid, you can glue in a little triangular gusset in that joint. Just cut one on the table saw, put it in place, and wick in the #4 on both sides. Hold it in place for a few minutes by hand, and you are done.
Zeph
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