Typo.
diff --git a/include/freetype/ftimage.h b/include/freetype/ftimage.h
index e21a220..1a049ef 100644
--- a/include/freetype/ftimage.h
+++ b/include/freetype/ftimage.h
@@ -619,7 +619,7 @@ FT_BEGIN_HEADER
/* */
/* { */
/* x' = (x << shift) - delta */
- /* y' = (x << shift) - delta */
+ /* y' = (y << shift) - delta */
/* } */
/* */
/* Set the values of `shift' and `delta' to~0 to get the original */