Unexpected behavior in git-rev-list

Hello people,

There's something I don't quite understand about git-rev-list.
After adding two files only one shows up with the --objects option.

I'm looking at commit e621a691e9bdbbe263ce34dd20458d9fbbf1a126 at

http://www.student.dtu.dk/~s022018/git/gitweb.cgi?p=recipes.git;a=summary

I can find the difference between the latest commit and it's parent:

git diff HEAD^ HEAD

diff --git a/HS-Plugins/20050403/Recipe b/HS-Plugins/20050403/Recipe
new file mode 100644
--- /dev/null
+++ b/HS-Plugins/20050403/Recipe

@@ -0,0 +1,16 @@
 [snip]

diff --git a/HS-Plugins/20050403/Resources/Dependencies

b/HS-Plugins/20050403/Resources/Dependencies
new file mode 100644

--- /dev/null
+++ b/HS-Plugins/20050403/Resources/Dependencies

@@ -0,0 +1,5 @@
 [snip] 

Notice that it creates exactly two files.  Now I expect the folllowing
objects:

tree HS-Plugins
tree 20050403
blob Recipe
tree Resources
blob Dependencies

Now what I understand so far is that we can list all objects reachable
from the HEAD commit but not reachable from its parent commit by: 

git-rev-list --objects ^HEAD^ HEAD

e621a691e9bdbbe263ce34dd20458d9fbbf1a126
609c26436053564e8df145b175d75df339b2318b
fe47bcfb8f47b55e3f6fabd2b2d188030fb57e1f HS-Plugins
6c8582e49c9f792f4f550fcf510432c84d24d868 20050403
808a68c33f87693c873f8f9c5f66c050a5ddc81e Recipe

My question is now: Why doesn't "git-rev-list --objects ^HEAD^ HEAD"
list the Dependencies blob?  I'm a bit confused.

Regards,

Peter