diff --git a/mapytex/calculus/API/expression.py b/mapytex/calculus/API/expression.py
index 282f67d..be39eda 100644
--- a/mapytex/calculus/API/expression.py
+++ b/mapytex/calculus/API/expression.py
@@ -97,7 +97,7 @@ class Expression(object):
         :example:
         >>> Expression.random("{a}/{a*k}") # doctest: +SKIP
         <Exp: -3 / -15>
-        >>> Expression.random("{a}/{a*k} - 3*{b}", variables_scope={'a':{'min_max':(10, 30)}})
+        >>> Expression.random("{a}/{a*k} - 3*{b}", variables_scope={'a':{'min_max':(10, 30)}}) # doctest +SKIP
         <Exp: 18 / 108 - 3 * 9>
 
         """