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--- a/bitcoin-information/investment-theses.html
+++ b/bitcoin-information/investment-theses.html
@@ -149,6 +149,7 @@ <h2 id="models"><a href="#models">Value Models:</a></h2>
             <li><a href="https://medium.com/@100trillionUSD/modeling-bitcoins-value-with-scarcity-91fa0fc03e25" title="Scarcity Model" target="_blank" rel="noopener">Modeling Bitcoin's Value with Scarcity</a> (stock-to-flow)</li>
             <li><a href="https://www.moonmath.win/" title="Price Projections" target="_blank" rel="noopener">Moon Math Price Projections</a></li>
             <li><a href="https://medium.com/@mcasey0827/speculative-bitcoin-adoption-price-theory-2eed48ecf7da" title="Speculative Adoption" target="_blank" rel="noopener">Speculative Bitcoin Adoption / Price Theory</a></li>
+            <li><a href="https://stackmath.xyz/" title="The Bitcoin Modeling Engine" target="_blank" rel="noopener">Stack Math</a> (Bitcoin Modeling Engine)</li>
           </ul>
           <h2 id="altcoins"><a href="#altcoins">On Altcoins:</a></h2>
           <ul>
@@ -202,4 +203,4 @@ <h2 id="altcoins"><a href="#altcoins">On Altcoins:</a></h2>
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