diff --git a/man7/unix.7 b/man7/unix.7
index 97661c8ca..e29e28bf1 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -72,6 +72,9 @@ The
 .I sun_family
 field always contains
 .BR AF_UNIX .
+On Linux
+.I sun_path
+is 108 bytes in size; see also NOTES, below.
 
 Various systems calls (for example,
 .BR bind (2),