diff --git a/ruby_event_store-active_record/rails_event_store_active_record.gemspec b/ruby_event_store-active_record/rails_event_store_active_record.gemspec
index e3c8120f8e..c27e51c92d 100644
--- a/ruby_event_store-active_record/rails_event_store_active_record.gemspec
+++ b/ruby_event_store-active_record/rails_event_store_active_record.gemspec
@@ -37,4 +37,14 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
+
+  spec.post_install_message = <<~EOW
+    The 'rails_event_store_active_record' gem has been renamed.
+
+    Please change your Gemfile or gemspec
+    to reflect its new name:
+
+    'ruby_event_store-active-record'
+
+  EOW
 end