diff --git a/charts/cert-management/templates/crds.yaml b/charts/cert-management/templates/crds.yaml
index c73d967b..18414395 100644
--- a/charts/cert-management/templates/crds.yaml
+++ b/charts/cert-management/templates/crds.yaml
@@ -196,6 +196,7 @@ spec:
           properties:
             commonName:
               description: CommonName is the CN for the certificate (max. 64 chars).
+              maxLength: 64
               type: string
             csr:
               description: CSR is the alternative way to provide CN,DNSNames and other
diff --git a/examples/10-crds.yaml b/examples/10-crds.yaml
index 9bc05dd0..48e4a23d 100644
--- a/examples/10-crds.yaml
+++ b/examples/10-crds.yaml
@@ -184,6 +184,7 @@ spec:
           properties:
             commonName:
               description: CommonName is the CN for the certificate (max. 64 chars).
+              maxLength: 64
               type: string
             csr:
               description: CSR is the alternative way to provide CN,DNSNames and other