diff --git a/README.md b/README.md
index 05a3d7d..02c96dd 100644
--- a/README.md
+++ b/README.md
@@ -29,3 +29,7 @@ This project split into 2 branches:
 
 * **default** that contains generic clock without any additional elements
 * **photoresistor** that contains additional hardware - photocell bridge - and software algorithm that compensates ambient light sensed by photocell basing on LED display charachteristics.
+
+### Stable tags for branches:
+v1.5 - default
+v1.4 - photoresistor