diff --git a/S21_sorter_state.ipynb b/S21_sorter_state.ipynb
index fd53c0a8..f00ee028 100644
--- a/S21_sorter_state.ipynb
+++ b/S21_sorter_state.ipynb
@@ -603,6 +603,7 @@
     "is sufficient to know that a discrete random variable takes a value from a countable set,\n",
     "each of which is assigned a probability value.\n",
     "For a random variable $X$, the CDF for $X$ is denoted by $F_X$, and is defined as\n",
+    "\n",
     "$$\n",
     "F_X(\\alpha) = P(X \\leq \\alpha)\n",
     "$$\n",
@@ -612,6 +613,7 @@
     "say $X \\in \\{ x_0, \\dots x_{n-1}\\}$, we can compute the CDF\n",
     "$F_X(\\alpha)$ by summing the probabilities assigned\n",
     "to all $x_i \\leq \\alpha$\n",
+    "\n",
     "$$\n",
     "F_X(\\alpha) = \\sum_{x_i \\leq \\alpha} P(x_i) = \\sum_{i=0}^{k-1} P(x_i)\n",
     "$$\n",