reflog: git rebase <upstream> <branch> vs git checkout <branch> && git rebase <upstream>

Hi Git community.

I have a question about reflog and "git-rebase(1) Manual Page".
As the man reads
------------------------- cut here -----------------------
git rebase [-i | --interactive] [options] [--exec <cmd>] [--onto <newbase>]
            [<upstream> [<branch>]]

... If <branch> is specified, git rebase will perform an automatic git checkout <branch> before doing anything else. Otherwise it remains on the current branch. ------------------------- cut here -----------------------

So I think that
  git rebase master b1
is the same as
  git checkout b1 && git rebase master
but in the reflog I see that the 'git rebase master b1' does not write 'git checkout b1'
into the reflog.

The question is - why there is no records in the reflog about ' automatic git checkout <branch>'? Or maybe git's man page is not accurate about this step?

Here is my test: ------------------------- cut here ----------------------- mkdir git_rebase cd git_rebase/ git init echo "master 1" > file.txt git add file.txt git commit -m "master 1" git checkout -b "b1" echo "branch b1" > file_b1.txt git add file_b1.txt git commit -m "b1 1" git checkout master echo "master 2" >> file.txt cat file.txt git add file.txt git commit -m "master 2"

# make a copy of repo directory (tar -cf ../repo_dir.tar .) tar -cf ../git_rebase.tar .

# git rebase <upstream> <branch> git reflog git rebase master b1 git reflog

# restore the repo cd .. rm -Rf git_rebase mkdir git_rebase && cd git_rebase && tar -xf ../git_rebase.tar

# git checkout <branch> && git rebase <upstream> git reflog git checkout b1 && git rebase master git reflog ------------------------- cut here -----------------------

# In the case 'git rebase master b1' # 'git reflog' shows cac9cc7 (HEAD -> b1) HEAD@{0}: rebase finished: returning to refs/heads/b1 cac9cc7 (HEAD -> b1) HEAD@{1}: rebase: b1 1 29c7386 (master) HEAD@{2}: rebase: checkout master 29c7386 (master) HEAD@{3}: commit: master 2 5cb30a2 HEAD@{4}: checkout: moving from b1 to master e75c314 HEAD@{5}: commit: b1 1 5cb30a2 HEAD@{6}: checkout: moving from master to b1 5cb30a2 HEAD@{7}: commit (initial): master 1

# In the case ' git checkout b1 && git rebase master ' c08d270 (HEAD -> b1) HEAD@{0}: rebase finished: returning to refs/heads/b1 c08d270 (HEAD -> b1) HEAD@{1}: rebase: b1 1 29c7386 (master) HEAD@{2}: rebase: checkout master e75c314 HEAD@{3}: checkout: moving from master to b1 /* This line is absent in case of 'git rebase master b1' */ 29c7386 (master) HEAD@{4}: commit: master 2 5cb30a2 HEAD@{5}: checkout: moving from b1 to master e75c314 HEAD@{6}: commit: b1 1 5cb30a2 HEAD@{7}: checkout: moving from master to b1 5cb30a2 HEAD@{8}: commit (initial): master 1

Best regards and many thanks for your work. Evgeny.

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