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-rw-r--r--doc/external-signer.md3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/external-signer.md b/doc/external-signer.md
index de44cdd880..1468e852ef 100644
--- a/doc/external-signer.md
+++ b/doc/external-signer.md
@@ -150,6 +150,9 @@ Example, display the first native SegWit receive address on Testnet:
The command MUST be able to figure out the address type from the descriptor.
+The command MUST return an object containing `{"address": "[the address]"}`.
+As a sanity check, for devices that support this, it SHOULD ask the device to derive the address.
+
If <descriptor> contains a master key fingerprint, the command MUST fail if it does not match the fingerprint known by the device.
If <descriptor> contains an xpub, the command MUST fail if it does not match the xpub known by the device.