diff --git a/resources/cljs-om-next/main_dev.cljs b/resources/cljs-om-next/main_dev.cljs
index 83b2f98..ed95294 100644
--- a/resources/cljs-om-next/main_dev.cljs
+++ b/resources/cljs-om-next/main_dev.cljs
@@ -13,4 +13,5 @@
 
 (core/init)
 
+;; Do not delete, root-el is used by the figwheel-bridge.js
 (def root-el (core/app-root))
\ No newline at end of file
diff --git a/resources/cljs-reagent/main_dev.cljs b/resources/cljs-reagent/main_dev.cljs
index 00bedb7..e73ac95 100644
--- a/resources/cljs-reagent/main_dev.cljs
+++ b/resources/cljs-reagent/main_dev.cljs
@@ -7,6 +7,8 @@
 
 (def cnt (r/atom 0))
 (defn reloader [] @cnt [core/app-root])
+
+;; Do not delete, root-el is used by the figwheel-bridge.js
 (def root-el (r/as-element [reloader]))
 
 (figwheel/watch-and-reload
diff --git a/resources/cljs-reagent6/main_dev.cljs b/resources/cljs-reagent6/main_dev.cljs
index 940e363..5fa2a56 100644
--- a/resources/cljs-reagent6/main_dev.cljs
+++ b/resources/cljs-reagent6/main_dev.cljs
@@ -8,6 +8,8 @@
 
 (def cnt (r/atom 0))
 (defn reloader [] @cnt [core/app-root])
+
+;; Do not delete, root-el is used by the figwheel-bridge.js
 (def root-el (r/as-element [reloader]))
 
 (defn force-reload! []
diff --git a/resources/cljs-rum/main_dev.cljs b/resources/cljs-rum/main_dev.cljs
index 6fae51c..a3ba7b0 100644
--- a/resources/cljs-rum/main_dev.cljs
+++ b/resources/cljs-rum/main_dev.cljs
@@ -12,4 +12,6 @@
 
 (core/init)
 
+
+;; Do not delete, root-el is used by the figwheel-bridge.js
 (def root-el (core/root-component-factory))