diff --git a/include/system/graphics.h b/include/system/graphics.h
index e206e3e..24e2bfb 100644
--- a/include/system/graphics.h
+++ b/include/system/graphics.h
@@ -78,7 +78,8 @@
      * - a vertical stride equal to the height
      *
      *   y_size = stride * height
-     *   c_size = ALIGN(stride/2, 16) * height/2
+     *   c_stride = ALIGN(stride/2, 16)
+     *   c_size = c_stride * height/2
      *   size = y_size + c_size * 2
      *   cr_offset = y_size
      *   cb_offset = y_size + c_size