diff --git a/tutorial/lisa2011/rrd-by-example/ex/update-real.txt b/tutorial/lisa2011/rrd-by-example/ex/update-real.txt
--- /dev/null
@@ -0,0 +1,5 @@
+ distance
+
+1200000300: 1.0000000000e-01
+1200000600: 1.0000000000e-01
+1200000900: 1.0000000000e-01