diff --git a/doc/tuto_GP_regression.rst b/doc/tuto_GP_regression.rst
index 3d3ab10a..fe0bdca1 100644
--- a/doc/tuto_GP_regression.rst
+++ b/doc/tuto_GP_regression.rst
@@ -141,4 +141,4 @@ The flag ``ARD=True`` in the definition of the Matern kernel specifies that we w
     :align:   center
     :height: 350px
 
-    Contour plot of the best predictor (posterior mean).
+    Contour plot of the mean predictor (posterior mean).