diff --git a/doc/src/week34/week34.do.txt b/doc/src/week34/week34.do.txt
index 1c8dcc58c..f134e871d 100644
--- a/doc/src/week34/week34.do.txt
+++ b/doc/src/week34/week34.do.txt
@@ -7,14 +7,14 @@ DATE: Week 34, August 21-25, 2021
 !split
 ===== Overview of first week =====
 
-The sessions on Tuesdays and Wednesdays last four hours and will
-include, partly, lectures in a flipped mode (promoting active learning)
+The sessions on Tuesdays and Wednesdays last four hours for each group (four in total) and will
+include lectures in a flipped mode (promoting active learning)
 and work on exercices and projects.  The sessions will begin with
 lectures and questions and answers about the material to be covered
 every week. There are four groups, Tuesdays 815am-12pm and 1215pm-4pm
 and Wednesdays 815am-12pm and 1215pm-4pm. Please sign up as soon as
 possible for one of the groups. Max capacity per group is 30-40
-persons.
+participants.
 
 On Thursdays we have a regular lecture. These lectures start at 1215pm and end at 2pm.
 The first week we wtart with simple linear regression, a repetition of linear algebra and elements of statistics needed for the course.