diff --git a/plugins/processes/proc_mem_by_user b/plugins/processes/proc_mem_by_user
index c199551a..5e763288 100644
--- a/plugins/processes/proc_mem_by_user
+++ b/plugins/processes/proc_mem_by_user
@@ -5,8 +5,10 @@
 #
 # Configure it by using the processes env var, i.e.:
 #
+# WARNING: SELINUX can block this plugin
+#
 # [proc_mem_by_user]
-# env.processes         munin-node jprod
+# env.users     munin-node         jprod
 #
 
 . $MUNIN_LIBDIR/plugins/plugin.sh
@@ -16,7 +18,7 @@ if [ "$1" = "autoconf" ]; then
         exit 0
 fi
 
-users=${processes:="munin-node"}
+users=${users:="munin-node"}
 
 if [ "$1" = "config" ]; then
         echo 'graph_title Memory usage by process by user'
@@ -37,4 +39,4 @@ fi
 
 for user in $users; do
         echo "$user.value " `ps u -U $user | awk 'BEGIN { sum = 0 } NR > 1 { sum += $6 }; END { print sum * 1024 }'`
-done
+done
\ No newline at end of file