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diff --git a/Master/texmf/doc/asymptote/examples/log2graph.asy b/Master/texmf/doc/asymptote/examples/log2graph.asy
new file mode 100644
index 00000000000..238f4126274
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+++ b/Master/texmf/doc/asymptote/examples/log2graph.asy
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+import graph;
+size(200,IgnoreAspect);
+
+// Base-2 logarithmic scale on y-axis:
+
+real log2(real x) {static real log2=log(2); return log(x)/log2;}
+real pow2(real x) {return 2^x;}
+
+scaleT yscale=scaleT(log2,pow2,logarithmic=true);
+scale(Linear,yscale);
+
+real f(real x) {return 1+x^2;}
+
+draw(graph(f,-4,4));
+
+yaxis("$y$",ymin=1,ymax=f(5),RightTicks(Label(Fill(white))),EndArrow);
+xaxis("$x$",xmin=-5,xmax=5,LeftTicks,EndArrow);