diff --git a/sys/circuit_sys/psd.go b/sys/circuit_sys/psd.go
index dfbe5c5..63835f1 100644
--- a/sys/circuit_sys/psd.go
+++ b/sys/circuit_sys/psd.go
@@ -70,20 +70,21 @@ func (p *PsdSys) Update(world ecs.World) {
 			var pabTd bool
 			for _, mkxEntry := range pmc.MkxList {
 				mkx := component.MkxType.Get(mkxEntry)
+				//门控箱站台门关闭
 				pcb := component.BitStateType.Get(mkx.PCB)
 				if !pcb.BypassEnable {
 					if mkx.PCB != nil && pcb.Val {
 						pcbTd = true
 					}
 				}
-
+				//门控箱站台门打开
 				pob := component.BitStateType.Get(mkx.POB)
 				if !pob.BypassEnable {
 					if mkx.POB != nil && pob.Val {
 						pobTd = true
 					}
 				}
-
+				//门控箱站台确认
 				pab := component.BitStateType.Get(mkx.PAB)
 				if !pab.BypassEnable {
 					if mkx.PAB != nil && pab.Val {