diff --git a/include/sta/timer.hpp b/include/sta/timer.hpp
index 8b71cf4..549d9b3 100644
--- a/include/sta/timer.hpp
+++ b/include/sta/timer.hpp
@@ -19,7 +19,7 @@ namespace sta
         /**
          * @brief Start Timer.
          * 
-         * @param millis in milliseconds
+         * @param millis Timer duration in milliseconds
          */
         virtual void start(uint32_t millis) = 0;
         /**