diff --git a/documentation/design.md b/documentation/design.md
index d321a78..3175d20 100644
--- a/documentation/design.md
+++ b/documentation/design.md
@@ -1,8 +1,14 @@
 
+# Database
+
+Default: https://github.com/nakabonne/tstorage
+
+Optional: influx?
+
 # Routes
 
 /targets
 
 /targets/:name
 
-/probes/:name
\ No newline at end of file
+/probes/:name