diff --git a/Concurrent Systems/notes/13 - Weak Bisimilarity.md b/Concurrent Systems/notes/13 - Weak Bisimilarity.md
index 70d5d1b..ae60fc9 100644
--- a/Concurrent Systems/notes/13 - Weak Bisimilarity.md	
+++ b/Concurrent Systems/notes/13 - Weak Bisimilarity.md	
@@ -91,7 +91,7 @@ This is a family of relations:
 - 3 pairs of the sixth form
 - 3 pairs of the seventh form
 
-Furthermore, we should also consider commutativity of parallel in pairs of the second, third, fourth, sixth, seventh and eighth form.
+Furthermore, **we should also consider commutativity** of parallel in pairs of the second, third, fourth, sixth, seventh and eighth form.
 
 Thus, R is actually made up of 1+6+2+2+9+6+6+2 = 34 pairs.
  *exercise: write down the LTSs*