diff --git a/doc/payment-api.md b/doc/payment-api.md
index 866491cb..f1bb7193 100644
--- a/doc/payment-api.md
+++ b/doc/payment-api.md
@@ -56,6 +56,9 @@ z_getnewaddress | | Return a new zaddr for sending and receiving payments. The s
z_listaddresses | | Returns a list of all the zaddrs in this node’s wallet for which you have a spending key.
Output:
{ [“z123…”, “z456...”, “z789...”] }
### Key Management
+
+**z9 alpha release note:** encrypted wallets are not yet fully supported. If the wallet is protected with a passphrase, zkeys will not be persisted to disk.
+
Command | Parameters | Description
--- | --- | ---
z_exportkey | zaddr | _Requires an unlocked wallet or an unencrypted wallet._
Return a zkey for a given zaddr belonging to the node’s wallet.
The key will be returned as a string formatted using Base58Check as described in the Zcash protocol spec.
Output:AKWUAkypwQjhZ6LLNaMuuuLcmZ6gt5UFyo8m3jGutvALmwZKLdR5