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-rw-r--r--src/txmempool.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/txmempool.h b/src/txmempool.h
index be9e83eb4b..d272114a7c 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -669,6 +669,13 @@ private:
/**
* CCoinsView that brings transactions from a memorypool into view.
* It does not check for spendings by memory pool transactions.
+ * Instead, it provides access to all Coins which are either unspent in the
+ * base CCoinsView, or are outputs from any mempool transaction!
+ * This allows transaction replacement to work as expected, as you want to
+ * have all inputs "available" to check signatures, and any cycles in the
+ * dependency graph are checked directly in AcceptToMemoryPool.
+ * It also allows you to sign a double-spend directly in signrawtransaction,
+ * as long as the conflicting transaction is not yet confirmed.
*/
class CCoinsViewMemPool : public CCoinsViewBacked
{