diff --git a/analysis/README.md b/analysis/README.md
index 15a744c..9db2ebe 100644
--- a/analysis/README.md
+++ b/analysis/README.md
@@ -3,7 +3,7 @@ Euclidean Distance calculation formula is as follows:
 $d(p,q)=\sqrt{\sum_{i=1}^n(p_i-q_i)^2}$
 ​
 
-
+### Contact Map
 
 protein contact map represents the distance between all possible amino acid residue pairs of a three-dimensional protein structure using a binary two-dimensional matrix. For two residues 
 ${\displaystyle i}$ and ${\displaystyle j}$, the ${\displaystyle ij}$ element of the matrix is 1 if the two residues are closer than a predetermined threshold, and 0 otherwise.