diff --git a/07_Day_Sets/07_sets.md b/07_Day_Sets/07_sets.md
index 26ca08e40..6532ad33e 100644
--- a/07_Day_Sets/07_sets.md
+++ b/07_Day_Sets/07_sets.md
@@ -371,9 +371,9 @@ python.symmetric_difference(dragon)  # {'r', 't', 'p', 'y', 'g', 'a', 'd', 'h'}
 # python ^ dragon
 ```
 
-### Joining Sets
+### DisJoining Sets
 
-If two sets do not have a common item or items we call them disjoint sets. We can check if two sets are joint or disjoint using _isdisjoint()_ method.
+If two sets do not have a common item or items we call them disjoint sets. We can check if two sets are joint or disjoint using _isdisjoint()_ method. Disjoint set also known as Null Set
 
 ```py
 # syntax