Add detail

EIPS/eip-831.md

@@ -26,7 +26,7 @@ Ethereum URIs contain "ethereum" or "eth" in their schema (protocol) part and ar
 
 ### Semantics
 
-`prefix` is optional and defines the use-case for this URI. If no prefix is given: "pay-" is assumed to be concise and ensure backward compatibility to a former URL format by @alexvandesande that was commonly used but never formalized and so cannot be mentioned by it's name without making the EIPW bot angry. When the prefix is omitted, the payload must start with `0x`. Also prefixes must not start with `0x`. So starting with `0x` can be used as a clear signal that there is no prefix.
+`prefix` is optional and defines the use-case for this URI. If no prefix is given: "pay-" is assumed to be concise and ensure backward compatibility to a former URL format by @alexvandesande (#67) that was commonly used but never formalized and so cannot be mentioned by it's name without making the EIPW bot angry. When the prefix is omitted, the payload must start with `0x`. Also prefixes must not start with `0x`. So starting with `0x` can be used as a clear signal that there is no prefix.
 
 `payload` is mandatory and the content depends on the prefix. Structuring of the content is defined in the ERC for the specific use-case and not in the scope of this document. One example is [EIP-681](./eip-681) for the pay- prefix.