Update README.md

toji · May 19, 2018 · 11f01b6 · 11f01b6
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diff --git a/README.md b/README.md
@@ -23,6 +23,7 @@ Contributing Guidelines
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 Contributions are welcome! 
 Please provide unit tests for new functionality. (See [TESTING.md](./TESTING.md) for details)
+When adding new functionality, please add some reasons that explain why and when the functionality is useful.
 
 Building
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