diff --git a/.mam.env.example b/.mam.env.example
index 6c8301c..a1d88f4 100644
--- a/.mam.env.example
+++ b/.mam.env.example
@@ -35,6 +35,10 @@
 #default: $HOME/.local/bin
 # LOCAL_BIN=$HOME/.local/bin
 
+# Isolated Herdr session socket name (`herdr --session <name>`).
+#default: mam-<workspace-slug>
+# HERDR_SESSION_NAME=mam-multi-agent-mux
+
 # ===========================================================================
 # delegate-job / MQTT broker
 # ===========================================================================