Document additional IsWitnessStandard behavior

Author: sipa

src/policy/policy.h

@@ -103,7 +103,9 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs,
     /**
      * Check if the transaction is over standard P2WSH resources limit:
      * 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements
-     * These limits are adequate for multi-signature up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL,
+     * These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL.
+     *
+     * Also enforce a maximum stack item size limit and no annexes for tapscript spends.
      */
 bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);