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diff --git a/docs/history/15-o3/code/examples/fact.zc b/docs/history/15-o3/code/examples/fact.zc
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+++ b/docs/history/15-o3/code/examples/fact.zc
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+fn fact(n) { if (n < 2) return 1; return n * fact(n - 1); }
+// prints in binary, like the old asm example
+fn bin(n) { if (n > 1) bin(n >> 1); putc('0' + (n & 1)); return 0; }
+fn main() { bin(fact(10)); putc(10); putn(fact(10)); putc(10); return 0; }