1 files changed, 69 insertions, 0 deletions
diff --git a/doc/man-sections/client-options.rst b/doc/man-sections/client-options.rst
index c5b7ad9..92a02e2 100644
--- a/doc/man-sections/client-options.rst
+++ b/doc/man-sections/client-options.rst
@@ -251,6 +251,75 @@ configuration.
   next remote succeeds. To silently ignore an option pushed by the server,
   use :code:`ignore`.
 
+--push-peer-info
+  Push additional information about the client to server. The following
+  data is always pushed to the server:
+
+  :code:`IV_VER=<version>`
+        The client OpenVPN version
+
+  :code:`IV_PLAT=[linux|solaris|openbsd|mac|netbsd|freebsd|win]`
+        The client OS platform
+
+  :code:`IV_LZO_STUB=1`
+        If client was built with LZO stub capability
+
+  :code:`IV_LZ4=1`
+        If the client supports LZ4 compressions.
+
+  :code:`IV_PROTO`
+    Details about protocol extensions that the peer supports. The
+    variable is a bitfield and the bits are defined as follows
+    (starting a bit 0 for the first (unused) bit:
+
+    - bit 1: The peer supports peer-id floating mechanism
+    - bit 2: The client expects a push-reply and the server may
+      send this reply without waiting for a push-request first.
+    - bit 3: The client is capable of doing key derivation using
+      RFC5705 key material exporter.
+    - bit 4: The client is capable of accepting additional arguments
+      to the `AUTH_PENDING` message.
+
+  :code:`IV_NCP=2`
+        Negotiable ciphers, client supports ``--cipher`` pushed by
+        the server, a value of 2 or greater indicates client supports
+        *AES-GCM-128* and *AES-GCM-256*.
+
+  :code:`IV_CIPHERS=<ncp-ciphers>`
+        The client announces the list of supported ciphers configured with the
+        ``--data-ciphers`` option to the server.
+
+  :code:`IV_GUI_VER=<gui_id> <version>`
+        The UI version of a UI if one is running, for example
+        :code:`de.blinkt.openvpn 0.5.47` for the Android app.
+
+  :code:`IV_SSO=[crtext,][openurl,][proxy_url]`
+        Additional authentication methods supported by the client.
+        This may be set by the client UI/GUI using ``--setenv``
+
+  When ``--push-peer-info`` is enabled the additional information consists
+  of the following data:
+
+  :code:`IV_HWADDR=<string>`
+        This is intended to be a unique and persistent ID of the client.
+        The string value can be any readable ASCII string up to 64 bytes.
+        OpenVPN 2.x and some other implementations use the MAC address of
+        the client's interface used to reach the default gateway. If this
+        string is generated by the client, it should be consistent and
+        preserved across independent session and preferably
+        re-installations and upgrades.
+
+  :code:`IV_SSL=<version string>`
+        The ssl version used by the client, e.g.
+        :code:`OpenSSL 1.0.2f 28 Jan 2016`.
+
+  :code:`IV_PLAT_VER=x.y`
+        The version of the operating system, e.g. 6.1 for Windows 7.
+
+  :code:`UV_<name>=<value>`
+        Client environment variables whose names start with
+        :code:`UV_`
+
 --remote args
   Remote host name or IP address, port and protocol.