diff --git a/design/20190708.certificate-request-crd.md b/design/20190708.certificate-request-crd.md
index 74b07f842..7e883a10a 100644
--- a/design/20190708.certificate-request-crd.md
+++ b/design/20190708.certificate-request-crd.md
@@ -107,7 +107,7 @@ same code base and repository.
 This proposal will create the following new API types in the
 `certmanager.k8s.io` group;
 
-```
+```golang
 // CertificateRequestSpec defines the desired state of CertificateRequest
 type CertificateRequestSpec struct {
 	// Requested certificate default Duration
@@ -156,7 +156,7 @@ The `CertificateRequestCondition` resembles much the same of the
 
 The `ObjectReference` field type has had a new field `Group` added as follows:
 
-```
+```golang
 // ObjectReference is a reference to an object with a given name, kind and group.
 type ObjectReference struct {
 	Name string `json:"name"`