README: add note about encoding implementations.

dchest · Jul 26, 2014 · 4e19366 · 4e19366
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diff --git a/README.md b/README.md
@@ -314,6 +314,11 @@ different lengths, or their contents differ.
 
 ### Utilities
 
+Encoding/decoding functions are provided for convenience. They are correct,
+however their performance and wide compatibility with uncommon runtimes is not
+something that is considered important compared to the simplicity and size of
+implementation. You can use third-party libraries if you need to.
+
 #### nacl.util.decodeUTF8(string)
 
 Decodes string and returns `Uint8Array` of bytes.