diff --git a/vignettes/tutorial.Rmd b/vignettes/tutorial.Rmd
index 101a8ed7a34e0022873c75f946a4b30f7210b454..70a14ab69548fc78dcc73be6a83ef71dd8e3a76b 100644
--- a/vignettes/tutorial.Rmd
+++ b/vignettes/tutorial.Rmd
@@ -90,7 +90,7 @@ The use of computing ressources can be controled with the following parameters:
 * `nbclusters` controls the number of clusters defined by k-means clustering for each repetition. Images showing moderate diversity (temperate forests) may need lower number of clusters (20), whereas highly diverse tropical forest require more (50). The larger the value the longer the computation time. 
 
 ```{r Computing options}
-nbCPU         = 4
+nbCPU         = 2
 MaxRAM        = 0.5
 nbclusters    = 50
 ```