Discuss optional interfaces per @dete advice

References: ethereum#165 (comment)
fulldecent · Feb 13, 2018 · 7558488 · 7558488
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commit 7558488
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diff --git a/EIPS/eip-165.md b/EIPS/eip-165.md
@@ -51,7 +51,9 @@ contract Selector {
 }
 ```
 
-Note: interfaces do not permit optional functions, therefore, the interface identity will not them.
+Note: interfaces do not permit optional functions, therefore, the interface identity will not include them.
+
+Note: an ERC standard may define multiple interfaces to separate core functionality from optional features. For example, [one draft standard defines](https://github.com/ethereum/EIPs/pull/841) ERC721, ERC721Metadata and ERC721Enumerable interfaces.
 
 ### How a Contract will Publish the Interfaces it Implements