diff --git a/docs/julia/heater_3d.jl b/docs/julia/heater_3d.jl
index 5e3dbffc..a2ea6959 100644
--- a/docs/julia/heater_3d.jl
+++ b/docs/julia/heater_3d.jl
@@ -150,4 +150,5 @@ GridapPETSc.with(args = split(options)) do
 
     t, s = getindex.(sums, 1), getindex.(sums, 2)
     lines!(ax, t * 1e3, s)
+    display(figure)
 end