diff --git a/.gitignore b/.gitignore
index a634c8a..edc9176 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 node_modules
 *-lock.json
 unuseful
--output.txt
\ No newline at end of file
+-output.txt
+.DS_Store
\ No newline at end of file
diff --git a/README.md b/README.md
index 0c12073..4d87af3 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Basically calculating the IoC of every chunk of text separated by a given guesse
 
 It uses chi-squared distribution to evaluate a goodness fit, testing whether an observed value and an expected value share the same frequencies.
 
- <img src="https://render.githubusercontent.com/render/math?math=\sum_{\displaystyle {\frac {\left({\text{observed}}-{\text{expected}}\right)^{2}}{\text{expected}}}}">
+ <img src="https://render.githubusercontent.com/render/math?math={\displaystyle \sum {\frac {\left({\text{observed}}-{\text{expected}}\right)^{2}}{\text{expected}}}}">
 
 ---