diff --git a/README.md b/README.md
index 0fe4d9812658cdae610250c7377fcb374b255a3a..1cc44197695a7c05e37f908b6a29ddb571010f22 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ Redis Operator creates/configures/manages redis-failovers atop Kubernetes.
 
 ## Requirements
 
+Minimum kubernetes version: 1.21
+
 Redis operator is being tested against kubernetes 1.22 1.23 1.24
 All dependencies have been vendored, so there's no need to any additional download.