All other sysctl entries mention it, and it is a per-namespace sysctl.

So mention it as well.

Fixes: 27069e7cb3d1 ("mptcp: disable active MPTCP in case of blackhole")
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 Documentation/networking/mptcp-sysctl.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/networking/mptcp-sysctl.rst b/Documentation/networking/mptcp-sysctl.rst
index 95598c21fc8e8782533bbc6a36de63bb465c297c..4ce31a2ac85be2daeb84c5447f06f69aabd18ef7 100644
--- a/Documentation/networking/mptcp-sysctl.rst
+++ b/Documentation/networking/mptcp-sysctl.rst
@@ -41,7 +41,7 @@ blackhole_timeout - INTEGER (seconds)
 	MPTCP is re-enabled and will reset to the initial value when the
 	blackhole issue goes away.
 
-	0 to disable the blackhole detection.
+	0 to disable the blackhole detection. This is a per-namespace sysctl.
 
 	Default: 3600
 

-- 
2.47.1