diff --git a/lib/tasks/shakapacker/info.rake b/lib/tasks/shakapacker/info.rake
index c271ad56..552e5ca5 100644
--- a/lib/tasks/shakapacker/info.rake
+++ b/lib/tasks/shakapacker/info.rake
@@ -1,5 +1,6 @@
 require "shakapacker/version"
 require "shakapacker/utils/misc"
+require "shakapacker/utils/manager"
 
 namespace :shakapacker do
   desc "Provide information on Shakapacker's environment"
@@ -10,6 +11,8 @@ namespace :shakapacker do
       $stdout.puts "Shakapacker: #{Shakapacker::VERSION}"
       $stdout.puts "Node: #{`node --version`}"
 
+      Shakapacker::Utils::Manager.warn_unless_package_manager_is_obvious!
+
       require "package_json"
 
       pj_manager = PackageJson.read.manager