diff --git a/rclcpp/include/rclcpp/timer.hpp b/rclcpp/include/rclcpp/timer.hpp
index afd690b8b0..0f9852c2f5 100644
--- a/rclcpp/include/rclcpp/timer.hpp
+++ b/rclcpp/include/rclcpp/timer.hpp
@@ -94,7 +94,7 @@ class TimerBase
 using VoidCallbackType = std::function<void ()>;
 using TimerCallbackType = std::function<void (TimerBase &)>;
 
-/// Generic timer templated on the clock type. Periodically executes a user-specified callback.
+/// Generic timer. Periodically executes a user-specified callback.
 template<
   typename FunctorT,
   typename std::enable_if<
@@ -109,6 +109,7 @@ class GenericTimer : public TimerBase
 
   /// Default constructor.
   /**
+   * \param[in] clock The clock providing the current time.
    * \param[in] period The interval at which the timer fires.
    * \param[in] callback User-specified callback function.
    */