diff --git a/session_1/session_1.Rmd b/session_1/session_1.Rmd
index ebe2706a639650a0a281196a5045843c48895d2e..48a1b6a954d598cae4d1eb644c07e47d9076c4ce 100644
--- a/session_1/session_1.Rmd
+++ b/session_1/session_1.Rmd
@@ -1084,4 +1084,4 @@ sessionInfo()
 browseVignettes("ggplot2")
 ```
 
-## See you in [R.2: "Introduction to Tidyverse"](/session_2/session_2.html) {.unnumbered}
+## See you in [R.2: "Introduction to Tidyverse"](/session_2/session_2.html) {.unnumbered .unlisted}
diff --git a/session_2/session_2.Rmd b/session_2/session_2.Rmd
index c55b4c0aadf8ee00918ead1271721cff98e7db5a..3e7c2207fae9847b1d99b64ae6afe3295381128a 100644
--- a/session_2/session_2.Rmd
+++ b/session_2/session_2.Rmd
@@ -562,7 +562,7 @@ ggplot(data = new_mpg, mapping = aes(x = displ, y = hwy, color = fuel)) +
 </p>
 </details>
 
-## See you in [R.3: Transformations with ggplot2](/session_3/session_3.html) {.unnumbered}
+## See you in [R.3: Transformations with ggplot2](/session_3/session_3.html) {.unnumbered .unlisted}
 
 ## To go further: publication ready plots
 
diff --git a/session_3/session_3.Rmd b/session_3/session_3.Rmd
index 452c2a0e647c16bf15de1432d16aa06c090eef1b..09a9513e052738db7f31c05bfcdff83901d5f894 100644
--- a/session_3/session_3.Rmd
+++ b/session_3/session_3.Rmd
@@ -333,7 +333,7 @@ ggplot(data = diamonds, mapping = aes(x = cut, fill = cut)) +
 
 By combining the right **geom**, **coordinates** and **faceting** functions, you can build a large number of different plots to present your results.
 
-## See you in [R.4: data transformation](/session_4/session_4.html) {.unnumbered}
+## See you in [R.4: data transformation](/session_4/session_4.html) {.unnumbered .unlisted}
 
 ## To go further:  animated plots from xls files
 
diff --git a/session_4/session_4.Rmd b/session_4/session_4.Rmd
index da060b90ba4a945dcf031fcde135eb1e585b3a7e..ed26d29ba5749f9ed8abf5f3140d6a65ef7b3223 100644
--- a/session_4/session_4.Rmd
+++ b/session_4/session_4.Rmd
@@ -647,7 +647,7 @@ mutate(
 - Ranking: there are a number of ranking functions, the most frequently used being min_rank(). They differ by the way ties are treated, etc. Try ?mutate, ?min_rank, ?rank, for more information.
 
 
-## See you in [R.5: Pipping and grouping](/session_5/session_5.html) {.unnumbered}
+## See you in [R.5: Pipping and grouping](/session_5/session_5.html) {.unnumbered .unlisted}
 
 
 ## To go further:  Data transformation and color sets.
diff --git a/session_5/session_5.Rmd b/session_5/session_5.Rmd
index 752b4c01e44f5b32d74a4935a1ffb9991dfb9bd1..704c36433b67475357d02b5c885facc4b4454fe5 100644
--- a/session_5/session_5.Rmd
+++ b/session_5/session_5.Rmd
@@ -388,4 +388,4 @@ flights %>%
 </p>
 </details>
 
-## See you in [R.6: tidydata](/session_6/session_6.html) {.unnumbered}
+## See you in [R.6: tidydata](/session_6/session_6.html) {.unnumbered .unlisted}
diff --git a/session_6/session_6.Rmd b/session_6/session_6.Rmd
index 07e4330af396771cb682656ab8db17a4b918aa2d..387f5e6f9fa06c4e3b0d8f34bfdabfafccd64803 100644
--- a/session_6/session_6.Rmd
+++ b/session_6/session_6.Rmd
@@ -318,4 +318,4 @@ These expect the x and y inputs to have the same variables, and treat the observ
 knitr::include_graphics('img/overview_set.png')
 ```
 
-## See you in [R.7: String & RegExp](/session_7/session_7.html) {.unnumbered}
+## See you in [R.7: String & RegExp](/session_7/session_7.html) {.unnumbered .unlisted}
diff --git a/session_7/session_7.Rmd b/session_7/session_7.Rmd
index 74c7337ae6af1996a8692e33d72b921329507fc3..0e1ae139c24bbcf88fb94a292b170e3ee1a13614 100644
--- a/session_7/session_7.Rmd
+++ b/session_7/session_7.Rmd
@@ -429,4 +429,4 @@ sentences %>%
   str_split("\\s")
 ```
 
-## See you in [R.8: Factors](/session_8/session_8.html) {.unnumbered}
+## See you in [R.8: Factors](/session_8/session_8.html) {.unnumbered .unlisted}