diff --git a/SCRATCHPAD.txt b/SCRATCHPAD.txt
index cbcddc5..a0ad269 100644
--- a/SCRATCHPAD.txt
+++ b/SCRATCHPAD.txt
@@ -11,3 +11,14 @@ RPC stuff that needs to be written in the architecture book:
 - https://github.com/Cuprate/cuprate/issues/278
 - binary strings -> full JSON: `get_transaction_pool_backlog`, `get_output_distribution`
 - not in `monerod` yet: `get_tx_ids_loose`
+
+## Differences with monerod (Request strictness)
+Some of `monerod`'s RPC request types contain fields not for users to provide,
+but for internal usage within the RPC handlers and `monerod` itself, some examples:
+- <LINK_TO_INTERNAL_FIELDS_IN_REQUEST_TYPE>
+
+Unless one of these actually allows something unintentionally bad to happen, this is mostly an unimportant detail.
+<CHECK_THAT_ONE_OF_THESE_FIELDS_ISNT_A_SECURITY_FLAW>
+
+Practically, it means users can provide these fields and `monerod` will deserialize them
+and accept them fine, while `cuprated` will not because they are not part of the type.