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

src/NadekoBot/Migrations/Sqlite/20221122204324_feed-text.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace NadekoBot.Migrations
+{
+    public partial class feedtext : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Message",
+                table: "FeedSub",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Message",
+                table: "FeedSub");
+        }
+    }
+}

src/NadekoBot/Migrations/Sqlite/NadekoSqliteContextModelSnapshot.cs

@@ -765,6 +765,9 @@ namespace NadekoBot.Migrations
                     b.Property<int>("GuildConfigId")
                         .HasColumnType("INTEGER");
 
+                    b.Property<string>("Message")
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("Url")
                         .IsRequired()
                         .HasColumnType("TEXT");