diff --git a/man7/cgroups.7 b/man7/cgroups.7
index 120750a53..6e249f3a7 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -474,6 +474,17 @@ The default value of the
 .IR release_agent
 file is empty, meaning that no release agent is invoked.
 .PP
+The content of the
+.I release_agent
+file can also be specified via a mount option when the
+cgroup filesystem is mounted:
+.PP
+.in +4n
+.EX
+mount -o release_agent=pathname ...
+.EE
+.in
+.PP
 Whether or not the
 .IR release_agent
 program is invoked when a particular cgroup becomes empty is determined