You can now specify an optional custom message in .feed and .yun which will be posted along with an update

src/NadekoBot/Migrations/Mysql/20221122204432_feed-text.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace NadekoBot.Migrations.Mysql
+{
+    public partial class feedtext : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "message",
+                table: "feedsub",
+                type: "longtext",
+                nullable: true)
+                .Annotation("MySql:CharSet", "utf8mb4");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "message",
+                table: "feedsub");
+        }
+    }
+}

src/NadekoBot/Migrations/Mysql/MysqlContextModelSnapshot.cs

@@ -975,6 +975,10 @@ namespace NadekoBot.Migrations.Mysql
                         .HasColumnType("int")
                         .HasColumnName("guildconfigid");
 
+                    b.Property<string>("Message")
+                        .HasColumnType("longtext")
+                        .HasColumnName("message");
+
                     b.Property<string>("Url")
                         .IsRequired()
                         .HasColumnType("varchar(255)")