diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1dbefca..6c2a6c1 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,7 +4,7 @@
 * Changed exception handling
   * now exceptions are chained (before they were added in `args`)
   * timeout errors are now chained (before they were not included at all)
-  * in case of dopiling, all callers are now notified about the error
+  * in case of dopiling, all callers are now notified about the error (see issue #23)
 
 1.2.1
 -----
diff --git a/examples/basic/_fix_case_to_be_removed.py b/examples/basic/_fix_case_to_be_removed.py
deleted file mode 100644
index db5b3ae..0000000
--- a/examples/basic/_fix_case_to_be_removed.py
+++ /dev/null
@@ -1,42 +0,0 @@
-import asyncio
-
-from memoize import memoize_configuration
-
-# needed if one has tornado installed (could be removed otherwise)
-memoize_configuration.force_asyncio = True
-
-from datetime import timedelta
-from memoize.wrapper import memoize
-from memoize.configuration import MutableCacheConfiguration
-from memoize.entrybuilder import ProvidedLifeSpanCacheEntryBuilder
-from memoize.eviction import NoEvictionStrategy
-from memoize.key import EncodedMethodReferenceAndArgsKeyExtractor
-from memoize.storage import LocalInMemoryCacheStorage
-from asyncio import sleep, gather
-
-
-@memoize(configuration=MutableCacheConfiguration(
-    configured=True,
-    storage=LocalInMemoryCacheStorage(),
-    key_extractor=EncodedMethodReferenceAndArgsKeyExtractor(),
-    method_timeout=timedelta(hours=1),
-    entry_builder=ProvidedLifeSpanCacheEntryBuilder(update_after=timedelta(hours=1), expire_after=timedelta(hours=1)),
-    eviction_strategy=NoEvictionStrategy(),
-))
-async def test():
-    await sleep(1)
-    raise ValueError("something went wrong")
-
-
-async def main():
-    results = await gather(test(), test(), test(), test(), return_exceptions=True)
-    for result in results:
-        print(result)
-        print(result.__cause__)
-
-    # see nice traceback in the console
-    await test()
-
-
-if __name__ == "__main__":
-    asyncio.get_event_loop().run_until_complete(main())