diff --git a/cvd/vision.h b/cvd/vision.h
index 99b5fd48..2a81d416 100644
--- a/cvd/vision.h
+++ b/cvd/vision.h
@@ -38,9 +38,9 @@
#endif
namespace CVD{
-/** Subsamples an image to 2/3 of its size by averaging 3x3 blocks in to 2x2 blocks.
+/** Subsamples an image to 2/3 of its size by averaging 3x3 blocks into 2x2 blocks.
@param in input image
-@param out output image (muze be out.size() == in.size()/2*3
)
+@param out output image (must be out.size() == in.size()/3*2
)
@throw IncompatibleImageSizes if out does not have the correct dimensions.
@ingroup gVision
*/