A.T. Robertson Commentary Ephesians 6:21

"But that ye also may know my affairs, how I do, Tychicus, the beloved brother and faithful minister in the Lord, shall make known to you all things:" — Ephesians 6:21 (ASV)

That ye also may know (ινα ειδητε κα υμεις). Final clause with ινα and second perfect subjunctive active of οιδα. For Tychicus, see Col 4:7f.