diff --git a/bundler/lib/bundler/cli.rb b/bundler/lib/bundler/cli.rb
index 1f6a65ca57ae..0f234f26b956 100644
--- a/bundler/lib/bundler/cli.rb
+++ b/bundler/lib/bundler/cli.rb
@@ -155,6 +155,10 @@ def self.default_command(meth = nil)
     def help(cli = nil)
       cli = self.class.all_aliases[cli] if self.class.all_aliases[cli]
 
+      if Bundler.settings[:plugins] && Bundler::Plugin.command?(cli) && !self.class.all_commands.key?(cli)
+        return Bundler::Plugin.exec_command(cli, ["--help"])
+      end
+
       case cli
       when "gemfile" then command = "gemfile"
       when nil       then command = "bundle"
diff --git a/bundler/spec/plugins/command_spec.rb b/bundler/spec/plugins/command_spec.rb
index f8dacb0e51ee..05d535a70cef 100644
--- a/bundler/spec/plugins/command_spec.rb
+++ b/bundler/spec/plugins/command_spec.rb
@@ -53,6 +53,40 @@ def exec(command, args)
     expect(out).to eq("You gave me tacos, tofu, lasange")
   end
 
+  it "passes help flag to plugin" do
+    update_repo2 do
+      build_plugin "helpful" do |s|
+        s.write "plugins.rb", <<-RUBY
+          module Helpful
+            class Command
+              Bundler::Plugin::API.command "greet", self
+
+              def exec(command, args)
+                if args.include?("--help") || args.include?("-h")
+                  puts "Usage: bundle greet [NAME]"
+                else
+                  puts "Hello"
+                end
+              end
+            end
+          end
+        RUBY
+      end
+    end
+
+    bundle "plugin install helpful --source https://gem.repo2"
+    expect(out).to include("Installed plugin helpful")
+
+    bundle "greet --help"
+    expect(out).to eq("Usage: bundle greet [NAME]")
+
+    bundle "greet -h"
+    expect(out).to eq("Usage: bundle greet [NAME]")
+
+    bundle "help greet"
+    expect(out).to eq("Usage: bundle greet [NAME]")
+  end
+
   it "raises error on redeclaration of command" do
     update_repo2 do
       build_plugin "copycat" do |s|