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-rw-r--r--src/coins.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/coins.h b/src/coins.h
index 077545a55b..7c1d6da2be 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -297,6 +297,9 @@ private:
void AddCoins(CCoinsViewCache& cache, const CTransaction& tx, int nHeight);
//! Utility function to find any unspent output with a given txid.
+// This function can be quite expensive because in the event of a transaction
+// which is not found in the cache, it can cause up to MAX_OUTPUTS_PER_BLOCK
+// lookups to database, so it should be used with care.
const Coin& AccessByTxid(const CCoinsViewCache& cache, const uint256& txid);
#endif // BITCOIN_COINS_H