diff --git a/sysctl.conf b/sysctl.conf
index fde6b53..27a8716 100644
--- a/sysctl.conf
+++ b/sysctl.conf
@@ -42,6 +42,8 @@ kernel.kptr_restrict = 2
 #   - 1: only a parent process can be debugged
 #   - 2: only admins can use ptrace (CAP_SYS_PTRACE capability required)
 #   - 3: disables ptrace completely, reboot is required to re-enable ptrace
+# be aware disabling ptrace completely breaks lxc v6+ procfs emulation for unprivileged containers
+# (see https://github.com/lxc/lxcfs/issues/636)
 kernel.yama.ptrace_scope = 3
 
 # restrict kernel logs to root only