diff --git a/spec/semver_spec.lua b/spec/semver_spec.lua
index e649323..966540d 100644
--- a/spec/semver_spec.lua
+++ b/spec/semver_spec.lua
@@ -39,7 +39,7 @@ context('semver', function()
       end)
     end)
 
-    describe('errors are thrown in', function()
+    describe('errors', function()
       test('no parameters are passed', function()
         assert_error(function() v() end)
       end)
@@ -62,6 +62,9 @@ context('semver', function()
       test('garbage at the end of the string', function()
         assert_error(function() v("1.2.3foobar") end)
       end)
+      test('a non-string or number is passed', function()
+        assert_error(function() v({}) end)
+      end)
     end)
   end)