Prayer: Forgetting One Sajdah and One Tashahhud
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1239
If a person forgets one sajdah and one tashahhud, he must perform sajdatā al‑sahw for the forgotten tashahhud, but it is not necessary for him to do so for the forgotten sajdah, although it is better that he does.