diff --git a/src/lib/addons/slack-app.ts b/src/lib/addons/slack-app.ts
index 9c38ec2294..e2e330e820 100644
--- a/src/lib/addons/slack-app.ts
+++ b/src/lib/addons/slack-app.ts
@@ -70,6 +70,9 @@ export default class SlackAppAddon extends Addon {
                 );
                 return;
             }
+            this.logger.debug(
+                `Found candidate channels: ${JSON.stringify(eventChannels)}.`,
+            );
 
             if (!this.slackClient || this.accessToken !== accessToken) {
                 const client = new WebClient(accessToken);