diff --git a/src/data/meta/Constants.h b/src/data/meta/Constants.h
index 8a736dd..8a1c7d7 100644
--- a/src/data/meta/Constants.h
+++ b/src/data/meta/Constants.h
@@ -1,3 +1,7 @@
+/// @file Constants.h
+/// @brief Constants header namespace.
+/// @author 30hours
+
 #ifndef CONSTANTS_H
 #define CONSTANTS_H
 
@@ -5,6 +9,7 @@
 
 namespace Constants
 {
+  /// @brief Speed of light (m/s).
   const uint32_t c = 299792458;
 }