diff --git a/config/300-subscription.yaml b/config/300-subscription.yaml
index 19f5d7f7d98..7e23623eba2 100644
--- a/config/300-subscription.yaml
+++ b/config/300-subscription.yaml
@@ -62,7 +62,9 @@ spec:
                   minLength: 1
                 kind:
                   type: string
-                  pattern: "^Channel$"
+                  # TODO remove this once we check for subscribable type.
+                  # Ending with Channel. E.g., Channel, InMemoryChannel, etc.
+                  pattern: "Channel$"
                 name:
                   type: string
                   minLength: 1
diff --git a/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation.go b/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation.go
index b415b68a183..75a7993d80f 100644
--- a/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation.go
+++ b/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation.go
@@ -18,6 +18,7 @@ package v1alpha1
 
 import (
 	"reflect"
+	"strings"
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/knative/pkg/apis"
@@ -30,21 +31,22 @@ func isChannelEmpty(f corev1.ObjectReference) bool {
 }
 
 // Valid from only contains the following fields:
-// - Kind       == 'Channel'
-// - APIVersion == 'eventing.knative.dev/v1alpha1'
+// - Kind       ends in 'Channel', e.g., 'Channel', 'InMemoryChannel', etc.
+// - APIVersion == 'eventing.knative.dev/v1alpha1' || 'messaging.knative.dev/v1alpha1'
 // - Name       == not empty
 func isValidChannel(f corev1.ObjectReference) *apis.FieldError {
 	errs := isValidObjectReference(f)
 
-	if f.Kind != "Channel" {
+	// TODO check whether is subscribable instead of doing this suffix match.
+	if !strings.HasSuffix(f.Kind, "Channel") {
 		fe := apis.ErrInvalidValue(f.Kind, "kind")
 		fe.Paths = []string{"kind"}
-		fe.Details = "only 'Channel' kind is allowed"
+		fe.Details = "only 'Channel$' kind is allowed"
 		errs = errs.Also(fe)
 	}
-	if f.APIVersion != "eventing.knative.dev/v1alpha1" {
+	if f.APIVersion != "eventing.knative.dev/v1alpha1" && f.APIVersion != "messaging.knative.dev/v1alpha1" {
 		fe := apis.ErrInvalidValue(f.APIVersion, "apiVersion")
-		fe.Details = "only eventing.knative.dev/v1alpha1 is allowed for apiVersion"
+		fe.Details = "only eventing.knative.dev/v1alpha1 or messaging.knative.dev/v1alpha1 are allowed for apiVersion"
 		errs = errs.Also(fe)
 	}
 	return errs
diff --git a/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation_test.go b/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation_test.go
index 1607bcd5035..e05f682133b 100644
--- a/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation_test.go
+++ b/pkg/apis/eventing/v1alpha1/subscribable_channelable_validation_test.go
@@ -39,7 +39,7 @@ var validationTests = []struct {
 		want: &apis.FieldError{
 			Message: "invalid value: Strait",
 			Paths:   []string{"kind"},
-			Details: "only 'Channel' kind is allowed",
+			Details: "only 'Channel$' kind is allowed",
 		},
 	},
 	{
@@ -52,8 +52,8 @@ var validationTests = []struct {
 		want: &apis.FieldError{
 			Message: `invalid value: eventing.knative.dev/v1alpha2`,
 			Paths:   []string{"apiVersion"},
-			Details: "only eventing.knative.dev/v1alpha1 " +
-				"is allowed for apiVersion",
+			Details: "only eventing.knative.dev/v1alpha1 or messaging.knative.dev/v1alpha1 " +
+				"are allowed for apiVersion",
 		},
 	},
 	{
@@ -65,6 +65,15 @@ var validationTests = []struct {
 		},
 		want: nil,
 	},
+	{
+		name: "valid channel messaging",
+		ref: corev1.ObjectReference{
+			Name:       "boaty-mcboatface",
+			APIVersion: "messaging.knative.dev/v1alpha1",
+			Kind:       "InMemoryChannel",
+		},
+		want: nil,
+	},
 }
 
 func TestIsChannelEmpty(t *testing.T) {
diff --git a/pkg/apis/eventing/v1alpha1/subscription_types.go b/pkg/apis/eventing/v1alpha1/subscription_types.go
index fd2166bfa23..445a24eefa5 100644
--- a/pkg/apis/eventing/v1alpha1/subscription_types.go
+++ b/pkg/apis/eventing/v1alpha1/subscription_types.go
@@ -76,8 +76,8 @@ type SubscriptionSpec struct {
 	//   - Kind
 	//   - APIVersion
 	//   - Name
-	// Kind must be "Channel" and APIVersion must be
-	// "eventing.knative.dev/v1alpha1"
+	// Kind must end in "Channel". E.g., "Channel", "InMemoryChannel", etc.
+	// APIVersion must be "eventing.knative.dev/v1alpha1" or "messaging.knative.dev/v1alpha1".
 	//
 	// This field is immutable. We have no good answer on what happens to
 	// the events that are currently in the channel being consumed from
diff --git a/pkg/apis/eventing/v1alpha1/subscription_validation_test.go b/pkg/apis/eventing/v1alpha1/subscription_validation_test.go
index d1dcc7ae35c..a4e3ae3b606 100644
--- a/pkg/apis/eventing/v1alpha1/subscription_validation_test.go
+++ b/pkg/apis/eventing/v1alpha1/subscription_validation_test.go
@@ -421,7 +421,7 @@ func TestValidChannel(t *testing.T) {
 		},
 		want: func() *apis.FieldError {
 			fe := apis.ErrInvalidValue("", "apiVersion")
-			fe.Details = "only eventing.knative.dev/v1alpha1 is allowed for apiVersion"
+			fe.Details = "only eventing.knative.dev/v1alpha1 or messaging.knative.dev/v1alpha1 are allowed for apiVersion"
 			return apis.ErrMissingField("apiVersion").Also(fe)
 		}(),
 	}, {
@@ -432,7 +432,7 @@ func TestValidChannel(t *testing.T) {
 		},
 		want: func() *apis.FieldError {
 			fe := apis.ErrInvalidValue("", "kind")
-			fe.Details = "only 'Channel' kind is allowed"
+			fe.Details = "only 'Channel$' kind is allowed"
 			return apis.ErrMissingField("kind").Also(fe)
 		}(),
 	}, {
@@ -444,7 +444,7 @@ func TestValidChannel(t *testing.T) {
 		},
 		want: func() *apis.FieldError {
 			fe := apis.ErrInvalidValue("subscription", "kind")
-			fe.Details = "only 'Channel' kind is allowed"
+			fe.Details = "only 'Channel$' kind is allowed"
 			return fe
 		}(),
 	}, {
@@ -456,7 +456,7 @@ func TestValidChannel(t *testing.T) {
 		},
 		want: func() *apis.FieldError {
 			fe := apis.ErrInvalidValue("wrongapiversion", "apiVersion")
-			fe.Details = "only eventing.knative.dev/v1alpha1 is allowed for apiVersion"
+			fe.Details = "only eventing.knative.dev/v1alpha1 or messaging.knative.dev/v1alpha1 are allowed for apiVersion"
 			return fe
 		}(),
 	}, {