.IR ENCAP_SEG6 " := "
.B seg6
.BR mode " [ "
-.BR encap " | " encap.red " | " inline " | " l2encap " | " l2encap.red " ] "
+.BR encap " | " encap.red " | " inline " | " l2encap " | " l2encap.red " ] ["
+.B tunsrc
+.IR ADDRESS " ]"
.B segs
.IR SEGMENTS " [ "
.B hmac
and the HMAC is not present, the SRH is omitted.
.sp
+.B tunsrc
+.I ADDRESS
+- IPv6 address of the tunnel source (outer header), not used with inline mode.
+It is optional: if not provided, the tunnel source address is chosen based on
+the per-netns configuration ("ip sr tunsrc set ADDRESS") or, if not configured,
+it is dynamically resolved. If provided, it takes priority over the per-netns
+configuration and dynamic resolution.
+.sp
+
.I SEGMENTS
- List of comma-separated IPv6 addresses
.sp