diff --git a/src/aiidalab_qe/app/static/styles/custom.css b/src/aiidalab_qe/app/static/styles/custom.css
index 876d68a9..24a62546 100644
--- a/src/aiidalab_qe/app/static/styles/custom.css
+++ b/src/aiidalab_qe/app/static/styles/custom.css
@@ -1,3 +1,8 @@
+/*
+  Override Jupyter width limitation to
+  make apps take full notebook width
+*/
 .output_subarea {
   max-width: none !important;
 }
+/* end override */