Index: bin/ps/print.c
===================================================================
--- bin/ps/print.c
+++ bin/ps/print.c
@@ -285,6 +285,8 @@
 		*cp++ = '+';
 	if (flag & P_JAILED)
 		*cp++ = 'J';
+	if (strncmp(k->ki_p->ki_emul, "Linux", strlen("Linux")) == 0)
+		*cp++ = '&';
 	*cp = '\0';
 	return (buf);
 }
Index: bin/ps/ps.1
===================================================================
--- bin/ps/ps.1
+++ bin/ps/ps.1
@@ -441,6 +441,9 @@
 The process is in the foreground process group of its control terminal.
 .It Li <
 The process has raised CPU scheduling priority.
+.It Li &
+The process is using
+.Xr linux 4 .
 .It Li C
 The process is in
 .Xr capsicum 4