diff --git a/book/_config.yml b/book/_config.yml
index d2dc32a..9f079ec 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -46,7 +46,7 @@ parse:
       ||Monday|Tuesday|Wednesday|Thursday|Friday|Upcoming|
       |:-:|:-:|:-:|:-:|:--:|:-:|:-:|
       |Homework deadlines ||| Read theory and make homework exercises [Statics](homework2.2) <br>{bdg-secondary}`Prerequisites` ||Internal forces|
-      |Class activities| Demonstration `Differential equations` <br>{bdg-primary-line}`New content`|||
+      |Class activities| Demonstration [Differential equations](lesson2.1) <br>{bdg-primary-line}`New content`|||
     week3: "To be provided"
     week4: "To be provided"
     week5: "To be provided"
diff --git a/book/week_1/session_1/intro.md b/book/week_1/session_1/intro.md
index 832812d..cb5f296 100644
--- a/book/week_1/session_1/intro.md
+++ b/book/week_1/session_1/intro.md
@@ -1,4 +1,4 @@
 (lesson1.1)=
 # Lesson Monday September 2nd
 
-During this lesson an overview will be given of the course as described in [Course information](../../course_information.md)
\ No newline at end of file
+During this lesson an overview will be given of the course as described in [Course information](../../course_information.md). Furthermore, we'll do a round of introduction.
\ No newline at end of file
diff --git a/book/week_1/session_2/intro.md b/book/week_1/session_2/intro.md
index 3e19d38..0ef9a5f 100644
--- a/book/week_1/session_2/intro.md
+++ b/book/week_1/session_2/intro.md
@@ -1,4 +1,4 @@
 (lesson1.2)=
 # Lesson Wednesday September 4th <br> {bdg-secondary-line}`Prerequisites`
 
-Basic model, transforming forces, equilibrium, support reactions and statical determinancy. 
\ No newline at end of file
+During this lesson you'll make a test on identifying which prerequisites you might need to spend some more time on.
\ No newline at end of file