diff --git a/.DS_Store b/.DS_Store
index 93022ae..7cee1cd 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/tutorial/normalization-yaffe-tanay.md b/tutorial/normalization-yaffe-tanay.md
index 4a306fc..e7d9eaf 100755
--- a/tutorial/normalization-yaffe-tanay.md
+++ b/tutorial/normalization-yaffe-tanay.md
@@ -223,8 +223,7 @@ python /HiCtool-master/scripts/HiCtool_yaffe_tanay.py \
 This part is to plot the heatmap and histogram for the enrichment normalized data ("observed over expected"). The **log2 of the data** is plotted to quantify the positive enrichment (red) and the negative enrichment (blue). Loci (pixels) equal to zero before performing the log2 (deriving from zero observed contacts) are shown in gray. Loci (pixels) where enrichment expected contact was zero before performing the ratio (observed / expected) are shown in black.
 
 To plot and save the heatmap and histogram use the following code:
-```
-unix
+```unix
 python /HiCtool-master/scripts/HiCtool_yaffe_tanay.py \
 --action plot_enrich \
 -i HiCtool_chr6_40kb_normalized_enrich.txt \