Solved Question about "git pull" output

I have cloned a Github repository which i update regularly.

If there are no upstream updates, most of the time the output of git pull is just
Bash:
xxx@xxx:~/development/crawl$ git pull
Already up to date.

But sometimes pulling in no changes results in different output
Bash:
xxx@xxx:~/development/crawl$ git pull
remote: Enumerating objects: 56, done.
remote: Counting objects: 100% (56/56), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 56 (delta 45), reused 56 (delta 45), pack-reused 0
Unpacking objects: 100% (56/56), 9.75 KiB | 39.00 KiB/s, done.
From https://github.com/crawl/crawl
   1640c2035a..792fb953b9  stone_soup-0.27 -> origin/stone_soup-0.27
Already up to date.

As you can see there were no updates, yet it seems to fetch something and changes the checksum of the branch.

What does it mean?
 
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