Clarify CCoinsViewMemPool documentation.

Thanks to @sdaftuar for correcting my misunderstanding.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/txmempool.h b/src/txmempool.h
index 78ac3c209b..70d7429f22 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -676,6 +676,13 @@ 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
 {