diff -Nurp orig/include/SDL_haptic.h p1/include/SDL_haptic.h
--- orig/include/SDL_haptic.h	2014-10-17 09:43:21.000000000 +0200
+++ p1/include/SDL_haptic.h	2014-10-17 14:49:52.000000000 +0200
@@ -347,6 +347,9 @@ typedef struct _SDL_Haptic SDL_Haptic;
 /**
  *  \brief Structure that represents a haptic direction.
  *
+ *  This is the direction where the force comes from,
+ *  instead of the direction in which the force is exerted.
+ *
  *  Directions can be specified by:
  *   - ::SDL_HAPTIC_POLAR : Specified by polar coordinates.
  *   - ::SDL_HAPTIC_CARTESIAN : Specified by cartesian coordinates.
diff -Nurp orig/src/haptic/linux/SDL_syshaptic.c p1/src/haptic/linux/SDL_syshaptic.c
--- orig/src/haptic/linux/SDL_syshaptic.c	2014-10-17 09:43:21.000000000 +0200
+++ p1/src/haptic/linux/SDL_syshaptic.c	2014-10-17 09:57:50.000000000 +0200
@@ -669,6 +669,8 @@ SDL_SYS_ToDirection(Uint16 *dest, SDL_Ha
                         90 deg -> 0x4000 (left)
                         180 deg -> 0x8000 (up)
                         270 deg -> 0xC000 (right)
+                   The force pulls into the direction specified by Linux directions,
+                   i.e. the opposite convention of SDL directions.
                     */
         tmp = ((src->dir[0] % 36000) * 0x8000) / 18000; /* convert to range [0,0xFFFF] */
         *dest = (Uint16) tmp;