diff --git a/ch10.jl b/ch10.jl
index 1c7c3ef..a214f3d 100644
--- a/ch10.jl
+++ b/ch10.jl
@@ -180,6 +180,7 @@ for _ in 1:10
 end
 walk
 
+using Plots
 plot(walk.x, walk.y;
      legend=false,
      series_annotations=1:11,