diff --git a/slides/BLcourse2.1.key b/slides/BLcourse2.1.key
index 479ab74ec7ad54ef285090479ad7bcf90f94c51c..bbdfcf3f6e83fa5d1cd81709eb893cad04a0dea3 100644
Binary files a/slides/BLcourse2.1.key and b/slides/BLcourse2.1.key differ