Add known issue about multi-line definitions

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -3,7 +3,9 @@
 This is a minimal web utility to calculate the `keccak256` hashes of the normalized event signatures of all the events in a Solidity code block. This hash can then be used with indexers like Etherscan to search for specific logs in the EVM history.
 
 > [!WARNING]<br>
-> This tool won't work with [user-defined value types](https://docs.soliditylang.org/en/latest/types.html#user-defined-value-types). For events that include these types, you must manually convert the user-defined value type into its equivalent primitive type.
+> **Known issues:**
+> - This tool won't work with [user-defined value types](https://docs.soliditylang.org/en/latest/types.html#user-defined-value-types). For events that include these types, you must manually convert the user-defined value type into its equivalent primitive type.
+> - This tool won't work with multi-line event definitions. For events that span multiple lines, you must manually collapse the definition into one line.
 
 ## Example