Here, I'll explain further.
Genesis 5:1, we have our introduction "these are the generations" or "this is the book of the generations".
And as we read, we see that the story is about Adams descendents. Seth, Enosh, Kenan, It lays out this genealogy. And it goes all the way to Noah, Shem, Ham, and Japeth.
But, we don't see Noah in Chapter 4 for example. Chapter 5 is tells us information that happens after chapter 4. Chapter 5 tells us about events that happen after chapter 4.
Or, lets pick another one.
Genesis 6:9
These are the generations of Noah.
Right, we know this story. Its the story of Noahs flood. But what about before this? It talks about the nephelim and the sons of God (that introduced their own form of sin to the land which prompted God to flood the earth).
So here again, the teledoth introduces a story that comes after the narrative before it. That is, Chapter 6:9 tells us the story of the flood, and before 6:9 is the pre-flood events.
Right, so we read the Bible in order. And these teledoth formulas, they almost always tell sequels. Part 2. Heres what comes next. They never re-tell stories.