diff --git a/Euler.ipynb b/Euler.ipynb
index 7f8900c..108632d 100644
--- a/Euler.ipynb
+++ b/Euler.ipynb
@@ -291,7 +291,7 @@
     "\n",
     "The Hugoniot loci for 1- and 3-shocks are\n",
     "\\begin{align}\n",
-    "    \\rho(p) &= \\left(\\frac{1 + \\beta p/p_0}{p/p_\\ell + \\beta} \\right),\\\\\n",
+    "    \\rho(p) &= \\left(\\frac{1 + \\beta p/p_0}{p/p_0 + \\beta} \\right)\\rho_0,\\\\\n",
     "    u(p) & = u_0 \\pm \\frac{2c_0}{\\sqrt{2\\gamma(\\gamma-1)}} \n",
     "        \\left(\\frac{1-p/p_0}{\\sqrt{1+\\beta p/p_0}}\\right), \\\\\n",
     "\\end{align}\n",