diff --git a/01_intro.md b/01_intro.md
index e358026..1daf347 100644
--- a/01_intro.md
+++ b/01_intro.md
@@ -7,7 +7,13 @@ cbm@math.ubc.ca
 
 office: LSK 303c
 
-office hours: TBA
+office hours: 
+
+     Monday 12:15 - 13:00, Thursday 10:00 - 11:00, Friday 12:30 - 13:45.
+ 
+     (subject to change)
+ 
+     Also by appointment
 
 - go over outline