Make testing usage clear

README.md

@@ -6,9 +6,9 @@
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-Mocks the require command to include the current package when the the `name` from the current packages `package.json` is required.
+Mocks the require command to include the current package when the `name` from the current `package.json` is required.
 
-Especially useful in tests if you want to require the package you're testing by name rather than relative paths.
+Uses `process.cwd()` to find the current `package.json` so this is only meant to be used as a dev dependency for testing. This will not work on a published package!
 
 ## Install