diff --git a/curriculum/challenges/english/25-front-end-development/lecture-working-with-audio-and-video/6733d8606fb893099e3d0df3.md b/curriculum/challenges/english/25-front-end-development/lecture-working-with-audio-and-video/6733d8606fb893099e3d0df3.md
index 7f67086d4c6..ffc401f39fd 100644
--- a/curriculum/challenges/english/25-front-end-development/lecture-working-with-audio-and-video/6733d8606fb893099e3d0df3.md
+++ b/curriculum/challenges/english/25-front-end-development/lecture-working-with-audio-and-video/6733d8606fb893099e3d0df3.md
@@ -106,7 +106,7 @@ Screen Capture API.
 
 ### --feedback--
 
-This core API extends the behaviour of media sources.
+This core API extends the behavior of media sources.
 
 ---
 
@@ -114,7 +114,7 @@ MediaStream Recording API.
 
 ### --feedback--
 
-This core API extends the behaviour of media sources.
+This core API extends the behavior of media sources.
 
 ---
 
@@ -126,7 +126,7 @@ Web Audio API.
 
 ### --feedback--
 
-This core API extends the behaviour of media sources.
+This core API extends the behavior of media sources.
 
 ## --video-solution--