diff --git a/units/sdl2.pas b/units/sdl2.pas
index 2d68861b..733a3afd 100644
--- a/units/sdl2.pas
+++ b/units/sdl2.pas
@@ -189,7 +189,7 @@ interface
 {$I sdlhaptic.inc}
 {$I sdlhidapi.inc}               // 2.0.18
 {$I sdltouch.inc}                // 2.24.0
-{$I sdlgesture.inc}
+{$I sdlgesture.inc}              // 2.26.2
 {$I sdlsyswm.inc}
 {$I sdlevents.inc}               // 2.24.0
 {$I sdllocale.inc}               // 2.0.14
diff --git a/units/sdlgesture.inc b/units/sdlgesture.inc
index 05aa6eeb..f89ec348 100644
--- a/units/sdlgesture.inc
+++ b/units/sdlgesture.inc
@@ -1,35 +1,70 @@
 //from "sdl_gesture.h"
 
 type
-  TSDL_GestureID = cint64;
+  TSDL_GestureID = type cint64;
 
   {* Function prototypes *}
 
-  {**
-   *  Begin Recording a gesture on the specified touch, or all touches (-1)
-   *
-   *
-   *}
-function SDL_RecordGesture(touchId: TSDL_TouchID): cint32 cdecl; external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_RecordGesture' {$ENDIF} {$ENDIF};
+  {/**
+ * Begin recording a gesture on a specified touch device or all touch devices.
+ *
+ * If the parameter `touchId` is -1 (i.e., all devices), this function will
+ * always return 1, regardless of whether there actually are any devices.
+ *
+ * \param touchId the touch device id, or -1 for all touch devices
+ * \returns 1 on success or 0 if the specified device could not be found.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetTouchDevice
+ *}
+function SDL_RecordGesture(touchId: TSDL_TouchID): cint; cdecl;
+  external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_RecordGesture' {$ENDIF} {$ENDIF};
 
   {**
-   *  Save all currently loaded Dollar Gesture templates
-   *
-   *
-   *}
-function SDL_SaveAllDollarTemplates(src: PSDL_RWops): cint32 cdecl; external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_SaveAllDollarTemplates' {$ENDIF} {$ENDIF};
+ * Save all currently loaded Dollar Gesture templates.
+ *
+ * \param dst a SDL_RWops to save to
+ * \returns the number of saved templates on success or 0 on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_LoadDollarTemplates
+ * \sa SDL_SaveDollarTemplate
+ *}
+function SDL_SaveAllDollarTemplates(dst: PSDL_RWops): cint; cdecl;
+  external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_SaveAllDollarTemplates' {$ENDIF} {$ENDIF};
 
   {**
-   *  Save a currently loaded Dollar Gesture template
-   *
-   *
-   *}
-function SDL_SaveDollarTemplate(gestureId: TSDL_GestureID; src: PSDL_RWops): cint32 cdecl; external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_SaveDollarTemplate' {$ENDIF} {$ENDIF};
+ * Save a currently loaded Dollar Gesture template.
+ *
+ * \param gestureId a gesture id
+ * \param dst a SDL_RWops to save to
+ * \returns 1 on success or 0 on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_LoadDollarTemplates
+ * \sa SDL_SaveAllDollarTemplates
+ *}
+function SDL_SaveDollarTemplate(gestureId: TSDL_GestureID; dst: PSDL_RWops): cint; cdecl;
+  external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_SaveDollarTemplate' {$ENDIF} {$ENDIF};
 
 
   {**
-   *  Load Dollar Gesture templates from a file
-   *
-   *
-   *}
-function SDL_LoadDollarTemplates(touchId: TSDL_TouchID; src: PSDL_RWops): cint32 cdecl; external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_LoadDollarTemplates' {$ENDIF} {$ENDIF};
+ * Load Dollar Gesture templates from a file.
+ *
+ * \param touchId a touch id
+ * \param src a SDL_RWops to load from
+ * \returns the number of loaded templates on success or a negative error code
+ *          (or 0) on failure; call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_SaveAllDollarTemplates
+ * \sa SDL_SaveDollarTemplate
+ *}
+function SDL_LoadDollarTemplates(touchId: TSDL_TouchID; src: PSDL_RWops): cint; cdecl;
+  external SDL_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_SDL_LoadDollarTemplates' {$ENDIF} {$ENDIF};