Git log follow question

Hi Everybody,

I'm having an issue understanding the way git log --follow works with git log --parents

When I run git log --parents --pretty=format:Commit:%H%nParent:%P%n%n alloc.c I get: Commit:4b25d091ba53c758fae0096b8c0662371857b9d9 Parent:100c5f3b0b27ec6617de1a785c4ff481e92636c1

Commit:100c5f3b0b27ec6617de1a785c4ff481e92636c1 Parent:2c1cbec1e2f0bd7b15fe5e921d287babfd91c7d3

Commit:2c1cbec1e2f0bd7b15fe5e921d287babfd91c7d3 Parent:579d1fbfaf25550254014fa472faac95f88eb779

Commit:579d1fbfaf25550254014fa472faac95f88eb779 Parent:855419f764a65e92f1d5dd1b3d50ee987db1d9de

Commit:855419f764a65e92f1d5dd1b3d50ee987db1d9de Parent:

When I try to run git log --parents --follow I get this: git log --parents --follow --pretty=format:Commit:%H%nParent:%P%n%n alloc.c

Commit:4b25d091ba53c758fae0096b8c0662371857b9d9 Parent:75b44066f3ed7cde238cdea1f0bf9e2f1744c820

Commit:100c5f3b0b27ec6617de1a785c4ff481e92636c1 Parent:2c1cbec1e2f0bd7b15fe5e921d287babfd91c7d3

Commit:2c1cbec1e2f0bd7b15fe5e921d287babfd91c7d3 Parent:f948792990f82a35bf0c98510e7511ef8acb9cd3

Commit:579d1fbfaf25550254014fa472faac95f88eb779 Parent:446c6faec69f7ac521b8b9fc2b1874731729032f

Commit:855419f764a65e92f1d5dd1b3d50ee987db1d9de Parent:64e86c57867593ba0ee77a7b0ff0eb8e9d4d8ed5

As you can see git log --parents and git log --follow --parents produce very different results, and as far as I can tell they should produce identical outputs.

Could somebody tell me if I'm doing something wrong with the syntax? Or have I stumbled onto a quirk I fail to understand?

Thanks, Albert