diff --git a/courses/dl1/lesson_4_x.md b/courses/dl1/lesson_4_x.md
index 21456ba..8d6ae84 100644
--- a/courses/dl1/lesson_4_x.md
+++ b/courses/dl1/lesson_4_x.md
@@ -49,7 +49,7 @@ type learner object, and you can see the layers:
`)`
-
+
### Dropout of p = 0.5
- p = probability of deleting the cell