diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 
 <img src="docs/images/kube-bench.png" width="200" alt="kube-bench logo">
 
-kube-bench is tool that checks whether Kubernetes is deployed securely by running the checks documented in the [CIS Kubernetes Benchmark](https://www.cisecurity.org/benchmark/kubernetes/).
+kube-bench is a tool that checks whether Kubernetes is deployed securely by running the checks documented in the [CIS Kubernetes Benchmark](https://www.cisecurity.org/benchmark/kubernetes/).
 
 Tests are configured with YAML files, making this tool easy to update as test specifications evolve.