diff --git a/retrieval/discovery/consul.go b/retrieval/discovery/consul.go
index 7c7f7349b..00f388d65 100644
--- a/retrieval/discovery/consul.go
+++ b/retrieval/discovery/consul.go
@@ -18,6 +18,7 @@ import (
 	"github.com/prometheus/prometheus/retrieval/discovery/consul"
 )
 
+// NewConsul creates a new Consul based Discovery.
 func NewConsul(cfg *config.ConsulSDConfig) (*consul.Discovery, error) {
 	return consul.NewDiscovery(cfg)
 }
diff --git a/retrieval/discovery/kubernetes/discovery.go b/retrieval/discovery/kubernetes/discovery.go
index fd7974f8f..4f639c50c 100644
--- a/retrieval/discovery/kubernetes/discovery.go
+++ b/retrieval/discovery/kubernetes/discovery.go
@@ -253,10 +253,10 @@ func (kd *Discovery) updateNode(node *Node, eventType EventType) {
 	defer kd.nodesMu.Unlock()
 	updatedNodeName := node.ObjectMeta.Name
 	switch eventType {
-	case deleted:
+	case Deleted:
 		// Deleted - remove from nodes map.
 		delete(kd.nodes, updatedNodeName)
-	case added, modified:
+	case Added, Modified:
 		// Added/Modified - update the node in the nodes map.
 		kd.nodes[updatedNodeName] = node
 	}
@@ -331,7 +331,7 @@ func (kd *Discovery) watchNodes(events chan interface{}, done <-chan struct{}, r
 		kd.nodes = map[string]*Node{}
 
 		for _, node := range nodes {
-			events <- &nodeEvent{added, node}
+			events <- &nodeEvent{Added, node}
 		}
 
 		req, err := http.NewRequest("GET", nodesURL, nil)
@@ -391,12 +391,12 @@ func (kd *Discovery) startServiceWatch(events chan<- interface{}, done <-chan st
 		for oldNSName, oldNS := range existingServices {
 			if ns, ok := services[oldNSName]; !ok {
 				for _, service := range existingServices[oldNSName] {
-					events <- &serviceEvent{deleted, service}
+					events <- &serviceEvent{Deleted, service}
 				}
 			} else {
 				for oldServiceName, oldService := range oldNS {
 					if _, ok := ns[oldServiceName]; !ok {
-						events <- &serviceEvent{deleted, oldService}
+						events <- &serviceEvent{Deleted, oldService}
 					}
 				}
 			}
@@ -407,7 +407,7 @@ func (kd *Discovery) startServiceWatch(events chan<- interface{}, done <-chan st
 
 		for _, ns := range services {
 			for _, service := range ns {
-				events <- &serviceEvent{added, service}
+				events <- &serviceEvent{Added, service}
 			}
 		}
 
@@ -510,9 +510,9 @@ func (kd *Discovery) updateService(service *Service, eventType EventType) *confi
 	defer kd.servicesMu.Unlock()
 
 	switch eventType {
-	case deleted:
+	case Deleted:
 		return kd.deleteService(service)
-	case added, modified:
+	case Added, Modified:
 		return kd.addService(service)
 	}
 	return nil
diff --git a/retrieval/discovery/kubernetes/types.go b/retrieval/discovery/kubernetes/types.go
index 52a75887e..28f5c31bf 100644
--- a/retrieval/discovery/kubernetes/types.go
+++ b/retrieval/discovery/kubernetes/types.go
@@ -13,12 +13,14 @@
 
 package kubernetes
 
+// EventType can legally only have the values defined as constants below.
 type EventType string
 
+// Possible values for EventType.
 const (
-	added    EventType = "ADDED"
-	modified EventType = "MODIFIED"
-	deleted  EventType = "DELETED"
+	Added    EventType = "ADDED"
+	Modified EventType = "MODIFIED"
+	Deleted  EventType = "DELETED"
 )
 
 type nodeEvent struct {
@@ -200,6 +202,7 @@ type NodeStatus struct {
 	Addresses []NodeAddress `json:"addresses,omitempty" description:"list of addresses reachable to the node; see http://releases.k8s.io/HEAD/docs/admin/node.md#node-addresses" patchStrategy:"merge" patchMergeKey:"type"`
 }
 
+// NodeAddressType can legally only have the values defined as constants below.
 type NodeAddressType string
 
 // These are valid address types of node. NodeLegacyHostIP is used to transit
@@ -211,6 +214,7 @@ const (
 	NodeInternalIP   NodeAddressType = "InternalIP"
 )
 
+// NodeAddress defines the address of a node.
 type NodeAddress struct {
 	Type    NodeAddressType `json:"type" description:"node address type, one of Hostname, ExternalIP or InternalIP"`
 	Address string          `json:"address" description:"the node address"`