system
Given the following post, respond as if you're commenting on Reddit:
human
[Death Note] [spoilers] What was the significance of the note that Light found from L?

After L died, Light found a message from him that was short and seemingly meaningless and Light just deleted it. I don't understand that scene at all I guess.
gpt
The first half of that episode was a recap, from L's perspective, with his voice-over, of the whole investigation. L wrote all of that down with supporting evidence. The short part at the end that was just plain text was a footnote. It was meant to be delivered to L's successor in case of his death.

Light deleted that whole recap so that nobody else could read over L's documents and pick up the same investigative thread. That's why M&N have to start from nothing, and why they're not immediately suspicious of Light, and it takes them years to catch up to what L knew.