diff --git a/10-Input/Classes/Japanese Notes.md b/10-Input/Classes/Japanese Notes.md
index 0f94bf2..2af4159 100644
--- a/10-Input/Classes/Japanese Notes.md	
+++ b/10-Input/Classes/Japanese Notes.md	
@@ -52,6 +52,12 @@ I hope I get promoted
 僕の公開講演は上手になるといいんですが
 I hope my public talk gets better
 
+## When -> とき
+To say when you did an activity, usually as a reference in time, you add -とき at the end of the verb for that sentence.
+
+### Examples
+パリに行った時にこのかばんを買いました
+That Time I was in paris, I bought this bag
 
 ## Potential Verbs
 Remind me to study later