diff --git a/ch10.r b/ch10.r
index bbdec77..365ffea 100644
--- a/ch10.r
+++ b/ch10.r
@@ -12,6 +12,19 @@ for (i in 1:20) {
 }
 
 matplot(t, x, lwd=2, col="gray")
-lines(t, 0.5*cos(2*pi*t), lwd=4, col="darkred")
 grid()
+lines(t, 0.5*cos(2*pi*t), lwd=4, col="darkred")
+
+## Example 10.6
+
+# R code for Example 10.6
+x = matrix(0, 1000, 20)
+t = seq(-2, 2, (2+2)/999)
 
+for (i in 1:20) {
+    x[,i] = cos(2*pi*t+2*pi*runif(1))
+}
+
+matplot(t, x, lwd=2, col="gray")
+grid()
+lines(t, 0*cos(2*pi*t), lwd=4, col="darkred")