diff --git a/lib/propshaft/railties/assets.rake b/lib/propshaft/railties/assets.rake
index a6160a6..977000d 100644
--- a/lib/propshaft/railties/assets.rake
+++ b/lib/propshaft/railties/assets.rake
@@ -2,6 +2,10 @@ namespace :assets do
   desc "Compile all the assets from config.assets.paths"
   task precompile: :environment do
     Rails.application.assets.processor.process
+    if Rails.env.development?
+      puts "Warning: You are precompiling assets in development. Rails will not " \
+        "serve any changed assets until you delete public/assets/.manifest.json"
+    end
   end
 
   desc "Remove config.assets.output_path"