diff --git a/pyexiv2/__init__.py b/pyexiv2/__init__.py
index a04b1f4..5bd43eb 100644
--- a/pyexiv2/__init__.py
+++ b/pyexiv2/__init__.py
@@ -27,3 +27,9 @@
   'convert_xmp_to_exif',
   'convert_xmp_to_iptc',
 ]
+
+
+def ImageMetadata(*args, **kwargs):
+    raise NameError('ImageMetadata() is the API of py3exiv2, see https://pypi.org/project/py3exiv2 . ' +
+              'However, the library you imported is pyexiv2, see https://pypi.org/project/pyexiv2 .')
+