diff --git a/README.md b/README.md
index 9aa2445..ef65afe 100644
--- a/README.md
+++ b/README.md
@@ -144,7 +144,7 @@ axes.legend(loc="lower left", fontsize=20)
 ```
 The output:
 
-<img src="https://github.com/ytarazona/forestools/blob/master/figures/serieNDFI_2.png?raw=true" width = 80%/>
+<img src="https://github.com/ytarazona/forestools/blob/master/figures/serieNDFI_2.jpg?raw=true" width = 90%/>
 
 ### 2.2 Detecting a change