diff --git a/README.md b/README.md
index de8b803..3866bbf 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ A simple DIY plant growing system (for cannabis).
   - easy to build up on a perfboard
   - easy to etch pcb
   - easy to access and modify
+  - low cost as possible! 
 
 ## Parts used