diff --git a/docs/src/tutorials/linear/tips_and_tricks.jl b/docs/src/tutorials/linear/tips_and_tricks.jl
index 6a34550a348..c0bcc0d4714 100644
--- a/docs/src/tutorials/linear/tips_and_tricks.jl
+++ b/docs/src/tutorials/linear/tips_and_tricks.jl
@@ -209,7 +209,7 @@ model = Model();
 # **Example** Either $x_1 \leq 1$ or $x_2 \leq 2$.
 
 model = Model();
-@variable(model, x[1:2])
+@variable(model, 0 <= x[1:2] <= 10)
 @variable(model, y[1:2], Bin)
 M = 100
 @constraint(model, x[1] <= 1 + M * y[1])
@@ -260,7 +260,7 @@ model = Model();
 # **Example** $x_1 + x_2 \leq 1$ if $z = 1$.
 
 model = Model();
-@variable(model, x[1:2])
+@variable(model, 0 <= x[1:2] <= 10)
 @variable(model, z, Bin)
 M = 100
 @constraint(model, sum(x) <= 1 + M * (1 - z))
@@ -268,7 +268,7 @@ M = 100
 # **Example** $x_1 + x_2 \leq 1$ if $z = 0$.
 
 model = Model();
-@variable(model, x[1:2])
+@variable(model, 0 <= x[1:2] <= 10)
 @variable(model, z, Bin)
 M = 100
 @constraint(model, sum(x) <= 1 + M * z)