diff --git a/commands/copy.md b/commands/copy.md
index bf2ea543..b968e944 100644
--- a/commands/copy.md
+++ b/commands/copy.md
@@ -3,10 +3,11 @@ key.
 
 By default, the `destination` key is created in the logical database used by the
 connection. The `DB` option allows specifying an alternative logical database
-index for the destination key.
+index for the destination key. The `REPLACE` option removes the `destination`
+key before copying the value to it.
 
-The command returns zero when the `destination` key already exists. The
-`REPLACE` option removes the `destination` key before copying the value to it.
+The command returns zero when the `source` key does not exist or when the
+`destination` key already exists and the `REPLACE` option is not specified. 
 
 ## Examples