diff --git a/units/en/unit1/hands-on.mdx b/units/en/unit1/hands-on.mdx
index b91eab6..e788cfb 100644
--- a/units/en/unit1/hands-on.mdx
+++ b/units/en/unit1/hands-on.mdx
@@ -315,8 +315,8 @@ We see with `Observation Space Shape (8,)` that the observation is a vector of s
 - Vertical speed (y)
 - Angle
 - Angular speed
-- If the left leg contact point has touched the land
-- If the right leg contact point has touched the land
+- If the left leg contact point has touched the land (boolean)
+- If the right leg contact point has touched the land (boolean)
 
 
 ```python