diff --git a/tests/resources/l10n/localizable.xpi b/tests/resources/l10n/localizable.xpi
new file mode 100644
index 0000000..b8fce56
Binary files /dev/null and b/tests/resources/l10n/localizable.xpi differ
diff --git a/tests/test_l10n.py b/tests/test_l10n.py
index 2bed3cc..f9c5671 100644
--- a/tests/test_l10n.py
+++ b/tests/test_l10n.py
@@ -17,10 +17,21 @@ def test_unlocalizable():
     "Test a package without localization data."
     
     l10n.LOCALE_CACHE = {}
-    _do_test("tests/resources/l10n/unlocalizable.xpi",
-             l10n.test_xpi,
-             failure=False,
-             set_type=PACKAGE_EXTENSION)
+    output = _do_test("tests/resources/l10n/unlocalizable.xpi",
+                      l10n.test_xpi,
+                      failure=False,
+                      set_type=PACKAGE_EXTENSION)
+    assert output.notices # Should alert about lack of locales
+
+def test_localizable():
+    "Tests a package with minimal localization data."
+
+    l10n.LOCALE_CACHE = {}
+    output = _do_test("tests/resources/l10n/localizable.xpi",
+                      l10n.test_xpi,
+                      failure=False,
+                      set_type=PACKAGE_EXTENSION)
+    assert not output.notices
 
 def test_missing():
     "Test a package with missing localization entities."
diff --git a/validator/testcases/l10ncompleteness.py b/validator/testcases/l10ncompleteness.py
index d81b631..8eea0e9 100644
--- a/validator/testcases/l10ncompleteness.py
+++ b/validator/testcases/l10ncompleteness.py
@@ -103,7 +103,17 @@ def test_xpi(err, package_contents, xpi_package):
     locales = _get_locales(err, xpi_package);
     
     # We need at least a reference and a target.
-    if len(locales) < 2:
+    num_locales = len(locales)
+    if num_locales < 2:
+        if num_locales == 0:
+            err.notice(("testcases_l10ncompleteness",
+                        "test_xpi",
+                        "no_locales"),
+                       "Add-on cannot be localized",
+                       "In order to localize this add-on, at least one "
+                       "'locale' entry needs to be present in the chrome."
+                       "manifest file.",
+                       filename="chrome.manifest")
         return
     
     # Use the first locale by default