diff --git a/README.md b/README.md
index 2f5e81b..179474b 100644
--- a/README.md
+++ b/README.md
@@ -213,7 +213,7 @@ This guide also provides you with _practical step-by-step instructions_ for buil
 A few simple rules for this project:
 
 - this guide is compliant with [OpenSCAP](https://www.open-scap.org/) (PCI-DSS)
-- is based on a minimal [RHEL](https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux) and [CentOS](https://www.centos.org/) installations
+- is based on a minimal [RHEL7](https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux) and [CentOS 7](https://www.centos.org/) installations
 - it does not exhaust everything about Linux hardening
 - it also contains non-related rules with PCI-DSS
 - some hardening rules/descriptions can be done better