diff --git a/slides/intro/intro.md b/slides/intro/intro.md
index 0574e3b6..3d598730 100644
--- a/slides/intro/intro.md
+++ b/slides/intro/intro.md
@@ -1,7 +1,7 @@
 ## A brief introduction
 
 - This was initially written by [Jérôme Petazzoni](https://twitter.com/jpetazzo) to support in-person,
-  instructor-led workshops and tutorials
+  instructor-led workshops and tutorials; credit is also due to [multiple contributors](https://github.com/jpetazzo/container.training/graphs/contributors)
 
 - You can also follow along on your own, at your own pace
 
diff --git a/slides/kube/intro.md b/slides/kube/intro.md
index 7a194d95..23e804a3 100644
--- a/slides/kube/intro.md
+++ b/slides/kube/intro.md
@@ -1,7 +1,7 @@
 ## A brief introduction
 
 - This was initially written by [Jérôme Petazzoni](https://twitter.com/jpetazzo) to support in-person,
-  instructor-led workshops and tutorials
+  instructor-led workshops and tutorials; credit is also due to [multiple contributors](https://github.com/jpetazzo/container.training/graphs/contributors)
 
 - You can also follow along on your own, at your own pace
 
diff --git a/slides/swarm/intro.md b/slides/swarm/intro.md
index 1311eff2..9c9f379e 100644
--- a/slides/swarm/intro.md
+++ b/slides/swarm/intro.md
@@ -1,7 +1,7 @@
 ## A brief introduction
 
 - This was initially written by [Jérôme Petazzoni](https://twitter.com/jpetazzo) to support in-person,
-  instructor-led workshops and tutorials
+  instructor-led workshops and tutorials; credit is also due to [multiple contributors](https://github.com/jpetazzo/container.training/graphs/contributors)
 
 - You can also follow along on your own, at your own pace