diff --git a/cas/apiv1/requests.go b/cas/apiv1/requests.go
index 2fa3c4ef..33a879ce 100644
--- a/cas/apiv1/requests.go
+++ b/cas/apiv1/requests.go
@@ -60,7 +60,7 @@ type CreateCertificateRequest struct {
 	Provisioner *ProvisionerInfo
 }
 
-// ProvisionerInfo contains information of the provisioner used to authorize an
+// ProvisionerInfo contains information of the provisioner used to authorize a
 // certificate.
 type ProvisionerInfo struct {
 	ProvisionerID   string