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diff --git a/README.md b/README.md
index d126e3b..d43be80 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,9 @@ For a submission to the upcoming "Reclaim your space" exhibition at [Hatch Art G
 ### [`jyoo980`](https://github.com/jyoo980)
 - [`scala`](./entries/jyoo980/scala/Fib.scala)
 
+## [`margoseltzer`](https://github.com/margoseltzer)
+- [`efficiency`](./entries/margoseltzer/efficiency.c)
+
 ### [`Metroxe`](https://github.com/Metroxe)
 - [`html`](./entries/Metroxe/index.html)