diff --git a/asynctest.nim b/asynctest.nim
new file mode 100644
index 0000000..4f74474
--- /dev/null
+++ b/asynctest.nim
@@ -0,0 +1,4 @@
+{.error:
+  "As of version 0.5.0 you need to import either " &
+  "asynctest/asyncdispatch/unittest or " &
+  "asynctest/chronos/unittest depending on your choice of async framework".}
diff --git a/asynctest/unittest2.nim b/asynctest/unittest2.nim
new file mode 100644
index 0000000..292e9e2
--- /dev/null
+++ b/asynctest/unittest2.nim
@@ -0,0 +1,4 @@
+{.error:
+  "As of version 0.5.0 you need to import either " &
+  "asynctest/asyncdispatch/unittest2 or " &
+  "asynctest/chronos/unittest2 depending on your choice of async framework".}