diff --git a/lib/decorators.ts b/lib/decorators.ts
index 15044b3f0..c0db3bce6 100644
--- a/lib/decorators.ts
+++ b/lib/decorators.ts
@@ -125,6 +125,7 @@ export const MappedParameters = {
 
     SlackChannel: "atomist://slack/channel",
     SlackChannelName: "atomist://slack/channel_name",
+    SlackChannelType: "atomist://slack/channel_type",
     SlackTeam: "atomist://slack/team",
     SlackUser: "atomist://slack/user",
     SlackUserName: "atomist://slack/user_name",
@@ -132,6 +133,11 @@ export const MappedParameters = {
     AtomistWebhookUrlBase: "atomist://base_webhook_url",
 };
 
+export enum SlackChannelType {
+    Channel = "channel",
+    User = "user",
+}
+
 export const Secrets = {
     OrgToken: "github://org_token",
     UserToken: "github://user_token",