diff --git a/python/1_2_Numbers_Strings.ipynb b/python/1_2_Numbers_Strings.ipynb
index 21eeb0a..b1a6d70 100644
--- a/python/1_2_Numbers_Strings.ipynb
+++ b/python/1_2_Numbers_Strings.ipynb
@@ -85,7 +85,7 @@
     "In Python3, there are the following [numeric types](https://docs.python.org/3/library/stdtypes.html#typesnumeric):\n",
     "* integers (int): 1, -1, ...\n",
     "* floating point numbers (float): 0.1, 1E2\n",
-    "* complex numbers (complex): 2 + 3j\n",
+    "* complex numbers (complex): 2 + 3j\n.",
     "Let's play a bit"
    ]
   },