diff --git a/docs/n2v_hpc/train.md b/docs/n2v_hpc/train.md
index a94409a..04b07e0 100644
--- a/docs/n2v_hpc/train.md
+++ b/docs/n2v_hpc/train.md
@@ -4,3 +4,6 @@ Now you are good to go. :rocket:
 
 Train a network using the first notebook, and predict on your images using
 the second one.
+
+:warning: In order to predict, you will need to shut down the training notebook
+in the main jupyter window.