diff --git a/PROTOCOL.agent b/PROTOCOL.agent
index da3381942..6947b46cd 100644
--- a/PROTOCOL.agent
+++ b/PROTOCOL.agent
@@ -2,4 +2,6 @@ This file used to contain a description of the SSH agent protocol
 implemented by OpenSSH. It has since been superseded by an Internet-
 draft that is available from:
 
+$OpenBSD: PROTOCOL.agent,v 1.13 2020/08/31 00:17:41 djm Exp $
+
 https://tools.ietf.org/html/draft-miller-ssh-agent-02
diff --git a/PROTOCOL.sshsig b/PROTOCOL.sshsig
index db18458fa..78457ddfc 100644
--- a/PROTOCOL.sshsig
+++ b/PROTOCOL.sshsig
@@ -97,3 +97,4 @@ the reserved field if it is not empty.
 The data is concatenated and passed to the SSH signing
 function.
 
+$OpenBSD: PROTOCOL.sshsig,v 1.4 2020/08/31 00:17:41 djm Exp $
diff --git a/PROTOCOL.u2f b/PROTOCOL.u2f
index fd31ea4ef..5b8a06277 100644
--- a/PROTOCOL.u2f
+++ b/PROTOCOL.u2f
@@ -368,3 +368,4 @@ In OpenSSH, the middleware will be invoked by using a similar mechanism to
 ssh-pkcs11-helper to provide address-space containment of the
 middleware from ssh-agent.
 
+$OpenBSD: PROTOCOL.u2f,v 1.25 2020/08/31 00:17:41 djm Exp $
diff --git a/sk-usbhid.c b/sk-usbhid.c
index 9b1f4b707..7c8ff8d98 100644
--- a/sk-usbhid.c
+++ b/sk-usbhid.c
@@ -1,3 +1,4 @@
+/* $OpenBSD: sk-usbhid.c,v 1.25 2020/08/31 00:17:41 djm Exp $ */
 /*
  * Copyright (c) 2019 Markus Friedl
  * Copyright (c) 2020 Pedro Martelletto
diff --git a/sshsig.c b/sshsig.c
index 658b8c852..0bd7e5cb7 100644
--- a/sshsig.c
+++ b/sshsig.c
@@ -1,3 +1,4 @@
+/* $OpenBSD: sshsig.c,v 1.17 2020/08/31 00:17:41 djm Exp $ */
 /*
  * Copyright (c) 2019 Google LLC
  *
diff --git a/sshsig.h b/sshsig.h
index 44157bc2a..67794a971 100644
--- a/sshsig.h
+++ b/sshsig.h
@@ -1,3 +1,4 @@
+/* $OpenBSD: sshsig.h,v 1.9 2020/08/31 00:17:41 djm Exp $ */
 /*
  * Copyright (c) 2019 Google LLC
  *