diff --git a/docs/src/guides/format.md b/docs/src/guides/format.md
index 2543ff6..5c0c79c 100644
--- a/docs/src/guides/format.md
+++ b/docs/src/guides/format.md
@@ -107,7 +107,7 @@ Note that this curve also specifies the production limits. Specifically, the fir
 
 ```@raw html
 <center>
-    <img src="../assets/cost_curve.png" style="max-width: 500px"/>
+    <img src="../../assets/cost_curve.png" style="max-width: 500px"/>
     <div><b>Figure 1.</b> Piecewise-linear production cost curve.</div>
     <br/>
 </center>