diff --git a/README.md b/README.md
index 5160bb4..e9d0136 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,20 @@
 # Budgeteer
 
-Budgeting Web-Application
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+Budgeting Web-Application
+
+## Data structure
+
+1 User
+N Budgets
+        AccountID[]
+        CategoryID[]
+        PayeeID[]
+
+N Accounts
+        TransactionID[]
+N Categories
+        AssignmentID[]
+N Payees
+
+N Transactions
+N Assignments
\ No newline at end of file