diff --git a/lib/hub/commands.rb b/lib/hub/commands.rb
index 44ce83bcc8d5bf2b56c31f42d1cd2bdabf40763e..583f00d2659003b78ef13701e654f05b1e47cf82 100644
--- a/lib/hub/commands.rb
+++ b/lib/hub/commands.rb
@@ -89,7 +89,17 @@ module Hub
         'fish' => 'alias git hub'
       }
 
-      shell = args[1]
+      if shell = args[1]
+        puts "Run this in your shell to start using `hub` as `git`:"
+        print "  "
+      else
+        puts "usage: hub install SHELL", ""
+        puts "known shells:"
+        shells.map { |key, _| key }.sort.each do |key|
+          puts "  " + key
+        end
+        exit
+      end
 
       if shells[shell]
         puts shells[shell]
@@ -162,7 +172,7 @@ help
 
     # All calls to `puts` in after hooks or commands are paged,
     # git-style.
-    def puts(content)
+    def puts(*args)
       page_stdout
       super
     end
diff --git a/test/helper.rb b/test/helper.rb
index 9b4258f8c5638d05c1ca71cccf6108b412c5a55b..dc4561e9f769ec82a4ee76182f3b98cfd4a5fe01 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -44,4 +44,25 @@ class Test::Unit::TestCase
   def assert_command(input, expected)
     assert_equal expected, Hub(input).command
   end
+
+  # Asserts that `hub` will show a specific installation command for a
+  # specific shell.
+  #
+  # e.g.
+  #  assert_install_command "sh", "alias git=hub"
+  #
+  # Here we are saying that this:
+  #   $ hub install sh
+  # Should display this:
+  #   Run this in your shell to start using `hub` as `git`:
+  #     alias git=hub
+  def assert_install_command(shell, command)
+    expected = "Run this in your shell to start using `hub` as `git`:\n  %s\n"
+    assert_equal(expected % command, hub("install #{shell}"))
+  end
+
+  # Asserts that `haystack` includes `needle`.
+  def assert_includes(needle, haystack)
+    assert haystack.include?(needle)
+  end
 end
diff --git a/test/install_test.rb b/test/install_test.rb
index ac422886ea2e41e47adf982ec3c688f7469104a7..2c26af52582d6aae410c20de5e156882733bbf49 100644
--- a/test/install_test.rb
+++ b/test/install_test.rb
@@ -2,27 +2,36 @@ $LOAD_PATH.unshift File.dirname(__FILE__)
 require 'helper'
 
 class InstallTest < Test::Unit::TestCase
+  def test_install
+    instructions = hub("install")
+    assert_includes "bash", instructions
+    assert_includes "sh", instructions
+    assert_includes "csh", instructions
+    assert_includes "zsh", instructions
+    assert_includes "fish", instructions
+  end
+
   def test_install_bash
-    assert_equal "alias git=hub\n", hub("install bash")
+    assert_install_command "bash", "alias git=hub"
   end
 
   def test_install_sh
-    assert_equal "alias git=hub\n", hub("install sh")
+    assert_install_command "sh", "alias git=hub"
   end
 
   def test_install_zsh
-    assert_equal "alias git=hub\n", hub("install zsh")
+    assert_install_command "zsh", "alias git=hub"
   end
 
   def test_install_csh
-    assert_equal "alias git hub\n", hub("install csh")
+    assert_install_command "csh", "alias git hub"
   end
 
   def test_install_fish
-    assert_equal "alias git hub\n", hub("install fish")
+    assert_install_command "fish", "alias git hub"
   end
 
   def test_install_blah
-    assert_equal "fatal: never heard of `blah'\n", hub("install blah")
+    assert_install_command "blah", "fatal: never heard of `blah'"
   end
 end