diff --git a/src/timer.hpp b/src/timer.hpp
index 7c9b4ae..984db24 100644
--- a/src/timer.hpp
+++ b/src/timer.hpp
@@ -3,8 +3,7 @@
 
 #include <cstdint>
 #include <mutex>
-#include <signal.h>
-#include <time.h>
+#include <csignal>
 
 namespace sc {
 
@@ -20,7 +19,7 @@ namespace sc {
         timer_t _tid;
 
         public:
-            timer(double time,
+            timer(double time, // seconds
                   bool repeat,
                   void(*expired_func)(const timer&),
                   void* context = nullptr);
@@ -30,7 +29,7 @@ namespace sc {
             timer(const timer&) = delete;
             timer& operator=(const timer&) = delete;
 
-            // forbid moveing
+            // forbid moving
             timer(timer&&) = delete;
             timer& operator=(timer&&) = delete;