diff --git a/rclcpp/include/rclcpp/executor.hpp b/rclcpp/include/rclcpp/executor.hpp
index 0f6b1f3..3063120 100644
--- a/rclcpp/include/rclcpp/executor.hpp
+++ b/rclcpp/include/rclcpp/executor.hpp
@@ -37,7 +37,7 @@ namespace executor
 {
 
 /// Coordinates the order and timing of available communication tasks.
-/* Executor provides spin functions (including spin_node_once and spin_some). 
+/* Executor provides spin functions (including spin_node_once and spin_some).
  * It coordinates the nodes and callback groups by looking for available work and completing it,
  * based on the threading or concurrency scheme provided by the subclass implementation.
  * An example of available work is executing a subscription callback, or a timer callback.
diff --git a/rclcpp/include/rclcpp/timer.hpp b/rclcpp/include/rclcpp/timer.hpp
index d488f80..c788fa6 100644
--- a/rclcpp/include/rclcpp/timer.hpp
+++ b/rclcpp/include/rclcpp/timer.hpp
@@ -101,7 +101,7 @@ public:
 
   /// Default constructor.
   /* \param[in] period The interval at which the timer fires.
-   * \param[in] callback User-specified callback function. 
+   * \param[in] callback User-specified callback function.
    */
   GenericTimer(std::chrono::nanoseconds period, CallbackType callback)
   : TimerBase(period, callback), loop_rate_(period)