diff --git a/probability-bernoulli-with-python.es.ipynb b/probability-bernoulli-with-python.es.ipynb
index 717b5e0..09c9265 100644
--- a/probability-bernoulli-with-python.es.ipynb
+++ b/probability-bernoulli-with-python.es.ipynb
@@ -132,7 +132,7 @@
         "id": "THV-KaywAGuf"
       },
       "source": [
-        "Que es igual a 0.6. De forma similar, la probabilidad de sello ($k = 0$): \n",
+        "Que es igual a 0.6. De forma similar, la probabilidad de sello ($k = 1$): \n",
         "\n",
         "$$f(1, .4) = .4 * 1 + (1 - 1)(1 - 1)$$\n",
         "\n",