diff --git a/3. Control flow.ipynb b/3. Control flow.ipynb
index c1a33ac..b097f71 100755
--- a/3. Control flow.ipynb	
+++ b/3. Control flow.ipynb	
@@ -54,9 +54,9 @@
     "```python\n",
     "if x < 0:\n",
     "   sign = -1\n",
-    "if x == 0\n",
+    "if x == 0:\n",
     "   sign = 0\n",
-    "if x > 0\n",
+    "if x > 0:\n",
     "   sign = 1\n",
     "```\n",
     "\n",