diff --git a/include/misc/Time.h b/include/misc/Time.h
index 37b4341..18a912d 100644
--- a/include/misc/Time.h
+++ b/include/misc/Time.h
@@ -39,7 +39,7 @@ public:
 // utililty class to call function at regular period of time
 class Timer {
 private:
-    std::uint64_t m_Interval;
+    std::uint64_t m_Interval; // in millis
     std::uint64_t m_InternalTime = 0;
 public:
     Timer() : m_Interval(0) {}
@@ -56,7 +56,7 @@ public:
 // utililty class to call function at regular period of time with a cooldown (used for towers)
 class CooldownTimer {
 private:
-    std::uint64_t m_Cooldown;
+    std::uint64_t m_Cooldown; // in millis
     std::uint64_t m_CooldownTime;
 public:
     CooldownTimer() : m_Cooldown(0), m_CooldownTime(0) {}