Headers and Footers but no tbody

In stage 6 namely "Tables" , there is a video called "Headers and Footers". In the intro of this video Nick tells us about Headers, Footers and also mentions Table bodies. However in the lecture he forgets to tell about tbody tag. In the quiz section where we have to solve the code by typing it, we are asked to add the tbody tag. Not knowing where to add this tag, I googled it and found out that it is used for grouping the main body of the table i.e. excluding header and footer section of the table the rest of the data is assigned to tbody tag. My suggestion is that either the video be revised or int he teacher's notes Nick should add a small note about this tag so that it could be helpful for those students who don't know.