diff --git a/include/SDL_haptic.h b/include/SDL_haptic.h
index eb87d6862..b66711209 100644
--- a/include/SDL_haptic.h
+++ b/include/SDL_haptic.h
@@ -558,7 +558,7 @@ typedef struct SDL_HapticPeriodic
     Uint16 period;      /**< Period of the wave. */
     Sint16 magnitude;   /**< Peak value; if negative, equivalent to 180 degrees extra phase shift. */
     Sint16 offset;      /**< Mean value of the wave. */
-    Uint16 phase;       /**< Horizontal shift given by hundredth of a degree. */
+    Uint16 phase;       /**< Positive phase shift given by hundredth of a degree. */
 
     /* Envelope */
     Uint16 attack_length;   /**< Duration of the attack. */