diff --git a/man2/setns.2 b/man2/setns.2
index 126630060..ca29b0220 100644
--- a/man2/setns.2
+++ b/man2/setns.2
@@ -16,6 +16,7 @@ Given a file descriptor referring to a namespace,
 reassociate the calling process with that namespace.
 
 .\" FIXME describe "fd" argument.
+.\" fds could come from UNIX domain sockets
 The
 .I nstype
 argument specifies which type of namespace
@@ -54,10 +55,11 @@ is set to indicate the error.
 is not a valid file descriptor.
 .TP
 .B EINVAL
-A file descriptor that does not match the specified nstype.
+A file descriptor that does not match the specified
+.IR nstype .
 
 .\" FIXME
-Attempting to change the mount namespace and the filesystem
+Attempted to change the mount namespace but the filesystem
 is shared between multiple tasks.
 .TP
 .B ENOMEM
@@ -92,4 +94,5 @@ in
 .SH SEE ALSO
 .BR clone (2),
 .BR fork (2),
-.BR vfork (2)
+.BR vfork (2),
+.BR proc (5)