diff --git a/include/sta/timer.hpp b/include/sta/timer.hpp
index f8c8a72..0ea4a07 100644
--- a/include/sta/timer.hpp
+++ b/include/sta/timer.hpp
@@ -27,6 +27,13 @@ namespace sta
          *
          */
         virtual void stop() = 0;
+        /**
+         * @brief Check if timer is running.
+         *
+         * @return true if timer is running
+         * @return false if timer is not running
+         */
+        virtual bool isRunning() = 0;
     };
 } // namespace sta