diff --git a/main.go b/main.go
index cbe7ba2..301a71a 100644
--- a/main.go
+++ b/main.go
@@ -67,6 +67,20 @@ import (
 // D1-3, R1-3			4 bytes					010.52			3	031.56
 // ---------------------------------------------------------------------------
 // Total															137.99
+//
+// Compared to no optimisations:
+//
+// Column				Column size (bytes)		Per month (MB)	X	Total (MB)
+// ---------------------------------------------------------------------------
+// Timestamps 			8 bytes					21.04
+// Values				4 bytes					10.52			21	220.92
+// ---------------------------------------------------------------------------
+// Total															241.96
+//
+// Conclusion:
+// At the expense of having to create more complicated queries for analysis and visualisation,
+// the optimisations save at least 103.97 MB or 1-137.99/241.96 = 43%
+// in uncompressed storage space per month.
 type Payload struct {
 	T   string `json:"t"`   // Timestamp
 	Dt1 *int   `json:"dt1"` // Delivered / imported meter reading tariff 1 (kWh)