diff --git a/spectrum/src/frontends/slack/SlackSession.h b/spectrum/src/frontends/slack/SlackSession.h
index e8bfa77ca6c4bb8305c343eea8d1200d7685d4c7..d8bfc8e2d9acd1826469e38482bbd93d0f7b1f16 100644
--- a/spectrum/src/frontends/slack/SlackSession.h
+++ b/spectrum/src/frontends/slack/SlackSession.h
@@ -51,6 +51,8 @@ class SlackSession {
 
 		void sendMessage(boost::shared_ptr<Swift::Message> message);
 
+		void sendMessageToAll(const std::string &msg);
+
 		void setPurpose(const std::string &purpose, const std::string &channel = "");
 
 		void setUser(User *user) {