diff --git a/configure/RELEASE b/configure/RELEASE
index 56f99a31..6f814996 100644
--- a/configure/RELEASE
+++ b/configure/RELEASE
@@ -40,6 +40,9 @@ IPAC=$(SUPPORT)/ipac/R2-12
 # Script module needed to build ScriptMotorController
 #!LUA=$(SUPPORT)/lua
 
+# Modbus module needed to build AMCI example IOC
+#!MODBUS=$(SUPPORT)/modbus
+
 # The following is only needed for the motor examples in iocBoot.
 #!MOTOR=$(TOP)
 
diff --git a/modules/Makefile b/modules/Makefile
index 91243b98..7768e9a7 100644
--- a/modules/Makefile
+++ b/modules/Makefile
@@ -77,6 +77,10 @@ endif
 ifdef LUA
 	$(ECHO) Creating $@, LUA = $(LUA)
 	@echo LUA = $(LUA)>> $@
+endif
+ifdef MODBUS
+	$(ECHO) Creating $@, MODBUS = $(MODBUS)
+	@echo MODBUS = $(MODBUS)>> $@
 endif
 	$(ECHO) Creating $@, EPICS_BASE = $(EPICS_BASE)
 	@echo EPICS_BASE = $(EPICS_BASE)>> $@