diff --git a/exercises/Exercise10.ipynb b/exercises/Exercise10.ipynb
index b976aef..8818cc0 100644
--- a/exercises/Exercise10.ipynb
+++ b/exercises/Exercise10.ipynb
@@ -14,7 +14,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 1 Shor Code\n",
+    "## 1. Shor Code\n",
     "\n",
     "The Shor (or 9 Qubit) code is a method for quantum error correction based on the classical repetition code. Here we will consider the version where a logical qubit is first stored in three physical qubits using the encoding\n",
     "$$\n",
@@ -53,7 +53,7 @@
     "id": "CJyxxSDUQQN9"
    },
    "source": [
-    "## 2  Concatenated Shor Code\n",
+    "## 2.  Concatenated Shor Code\n",
     "\n",
     "In order to increase the performance of a code we can use the concept of concatenation. We will now consider this process for the Shor code.\n",
     "\n",