+Sometimes things change. This example used to provide numbers like
+"0.04" in stead of "4.00000e-02". Those are really the same numbers,
+just written down differently. Don't be alarmed if a future version
+of rrdtool displays a slightly different form of output. The examples
+in this document are correct for version 1.2.0 of RRDtool.
+
+Also, sometimes bugs do occur. They may also influence the outcome of
+the examples. Example speed4.png was suffering from this (the handling
+of unknown data in an if-statement was wrong). Normal data will be
+just fine (a bug in rrdtool wouldn't last long) but special cases like
+NaN, INF and so on may last a bit longer. Try another version if you
+can, or just live with it.
+
+I fixed the speed4.png example (and added a note). There may be other
+examples which suffer from the same or a similar bug. Try to fix it
+yourself, which is a great excercise. But please do not submit your
+result as a fix to the source of this document. Discuss it on the
+user's list, or write to me.
+