diff --git a/README.rst b/README.rst
index 9611fb6..646409c 100644
--- a/README.rst
+++ b/README.rst
@@ -67,7 +67,7 @@ customized :code:`unasync.Rule` instances to :code:`unasync.cmdclass_build_py()`
             # This rule's 'fromdir' is more specific so will take precedent
             # over the above rule if the path is within /ahip/tests/...
             # This rule adds an additional token replacement over the default replacements.
-            unasync.Rule("/ahip/tests/", "/hip/tests/", replacements={"ahip", "hip"}),
+            unasync.Rule("/ahip/tests/", "/hip/tests/", replacements={"ahip": "hip"}),
         ])},
         ...
     )
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 61ba167..a5f09fc 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -81,7 +81,7 @@ customized :code:`unasync.Rule` instances to :code:`unasync.cmdclass_build_py()`
             # This rule's 'fromdir' is more specific so will take precedent
             # over the above rule if the path is within /ahip/tests/...
             # This rule adds an additional token replacement over the default replacements.
-            unasync.Rule("/ahip/tests/", "/hip/tests/", replacements={"ahip", "hip"}),
+            unasync.Rule("/ahip/tests/", "/hip/tests/", replacements={"ahip": "hip"}),
         ])},
         ...
     )