Model: reference git internals documentation

hoijui created

Change summary

doc/model.md | 4 ++++
1 file changed, 4 insertions(+)

Detailed changes

doc/model.md 🔗 

@@ -1,5 +1,9 @@
 # Data model
 
+If you are not familiar with [git internals](https://git-scm.com/book/en/v1/Git-Internals),
+you might first want to read about them,
+as the `git-bug` data model is built on top of them.
+
 The biggest problem when creating a distributed bug tracker is that there is no central authoritative server (doh!). This implies some constraints.
 
 ## Anybody can create and edit bugs at the same time as you