diff --git a/backend/internal/handler/dto/mappers.go b/backend/internal/handler/dto/mappers.go
index d58a8a29..886a5535 100644
--- a/backend/internal/handler/dto/mappers.go
+++ b/backend/internal/handler/dto/mappers.go
@@ -321,7 +321,7 @@ func RedeemCodeFromServiceAdmin(rc *service.RedeemCode) *AdminRedeemCode {
 }
 
 func redeemCodeFromServiceBase(rc *service.RedeemCode) RedeemCode {
-	return RedeemCode{
+	out := RedeemCode{
 		ID:           rc.ID,
 		Code:         rc.Code,
 		Type:         rc.Type,
@@ -335,6 +335,14 @@ func redeemCodeFromServiceBase(rc *service.RedeemCode) RedeemCode {
 		User:         UserFromServiceShallow(rc.User),
 		Group:        GroupFromServiceShallow(rc.Group),
 	}
+
+	// For admin_balance/admin_concurrency types, include notes so users can see
+	// why they were charged or credited by admin
+	if (rc.Type == "admin_balance" || rc.Type == "admin_concurrency") && rc.Notes != "" {
+		out.Notes = &rc.Notes
+	}
+
+	return out
 }
 
 // AccountSummaryFromService returns a minimal AccountSummary for usage log display.
diff --git a/backend/internal/handler/dto/types.go b/backend/internal/handler/dto/types.go
index 938d707c..4cfaef5f 100644
--- a/backend/internal/handler/dto/types.go
+++ b/backend/internal/handler/dto/types.go
@@ -198,6 +198,10 @@ type RedeemCode struct {
 	GroupID      *int64 `json:"group_id"`
 	ValidityDays int    `json:"validity_days"`
 
+	// Notes is only populated for admin_balance/admin_concurrency types
+	// so users can see why they were charged or credited
+	Notes *string `json:"notes,omitempty"`
+
 	User  *User  `json:"user,omitempty"`
 	Group *Group `json:"group,omitempty"`
 }
diff --git a/frontend/src/api/redeem.ts b/frontend/src/api/redeem.ts
index 9e1c7d94..22abf4d8 100644
--- a/frontend/src/api/redeem.ts
+++ b/frontend/src/api/redeem.ts
@@ -14,7 +14,9 @@ export interface RedeemHistoryItem {
   status: string
   used_at: string
   created_at: string
-  // 订阅类型专用字段
+  // Notes from admin for admin_balance/admin_concurrency types
+  notes?: string
+  // Subscription-specific fields
   group_id?: number
   validity_days?: number
   group?: {
diff --git a/frontend/src/views/user/RedeemView.vue b/frontend/src/views/user/RedeemView.vue
index 96158596..5850c084 100644
--- a/frontend/src/views/user/RedeemView.vue
+++ b/frontend/src/views/user/RedeemView.vue
@@ -312,6 +312,14 @@
                 <p v-else class="text-xs text-gray-400 dark:text-dark-500">
                   {{ t('redeem.adminAdjustment') }}
                 </p>
+                <!-- Display notes for admin adjustments -->
+                <p
+                  v-if="item.notes"
+                  class="mt-1 text-xs text-gray-500 dark:text-dark-400 italic max-w-[200px] truncate"
+                  :title="item.notes"
+                >
+                  {{ item.notes }}
+                </p>
               </div>
             </div>
           </div>