diff --git a/channels/pkg/api/channel.go b/channels/pkg/api/channel.go
index 97c0850815..61657f5ea8 100644
--- a/channels/pkg/api/channel.go
+++ b/channels/pkg/api/channel.go
@@ -70,18 +70,32 @@ type AddonSpec struct {
 
 	Version string `json:"version,omitempty"`
 
+	// PruneSpec specifies how old objects should be removed (pruned).
 	Prune *PruneSpec `json:"prune,omitempty"`
 }
 
+// PruneSpec specifies how old objects should be removed (pruned).
 type PruneSpec struct {
+	// Kinds specifies the objects to be pruned, by Kind.
 	Kinds []PruneKindSpec `json:"kinds,omitempty"`
 }
 
+// PruneKindSpec specifies pruning for a particular Kind of object.
 type PruneKindSpec struct {
-	Group         string   `json:"group,omitempty"`
-	Kind          string   `json:"kind,omitempty"`
-	Namespaces    []string `json:"namespaces,omitempty"`
-	LabelSelector string   `json:"labelSelector,omitempty"`
+	// Group specifies the object Group to be pruned (required).
+	Group string `json:"group,omitempty"`
+	// Kind specifies the object Kind to be pruned (required).
+	Kind string `json:"kind,omitempty"`
+
+	// Namespaces limits pruning only to objects in certain namespaces.
+	Namespaces []string `json:"namespaces,omitempty"`
+
+	// LabelSelector limits pruning only to objects matching the specified labels.
+	LabelSelector string `json:"labelSelector,omitempty"`
+
+	// FieldSelector allows pruning only of objects matching the field selector.
+	// (This isn't currently used, but adding it now lets us start without worrying about version skew)
+	FieldSelector string `json:"fieldSelector,omitempty"`
 }
 
 func (a *Addons) Verify() error {
diff --git a/channels/pkg/channels/prune.go b/channels/pkg/channels/prune.go
index 5e6bd404a3..33c35bb4d6 100644
--- a/channels/pkg/channels/prune.go
+++ b/channels/pkg/channels/prune.go
@@ -83,6 +83,7 @@ func (p *Pruner) pruneObjectsOfKind(ctx context.Context, gk schema.GroupKind, sp
 
 	var listOptions v1.ListOptions
 	listOptions.LabelSelector = spec.LabelSelector
+	listOptions.FieldSelector = spec.FieldSelector
 
 	baseResource := p.Client.Resource(gvr)
 	if len(spec.Namespaces) == 0 {