diff --git a/README.md b/README.md
index 6caccff..902676b 100644
--- a/README.md
+++ b/README.md
@@ -121,4 +121,12 @@ The following states are tracked in the `EntityState.State` property:
 * **Modified**: changes are made to the entity.
 * **Deleted**: the entity is in the database, but is marked for deletion.
 
-The `Find` functions require tracking, instead, use the `First` function, with a lambda for the ID.
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+The `Find` functions require tracking, instead, use the `First` function, with a lambda for the ID.
+
+## Database
+
+### Relationships
+
+* A **League** has one or more **Teams** (1:M)
+* A **Team** has one **Coach** (1:1)
+* **Matches** are played by many **Teams** (M:M)
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