diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a4db30..4f6e67f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ input objects for methods that require input objects.
  * Added object `\TgBotLib\Objects\Telegram\InlineQueryResult\InlineQueryResultArticle`, see [InlineQueryResultArticle](https://core.telegram.org/bots/api#inlinequeryresultarticle) for more information.
  * Added object `\TgBotLib\Objects\Telegram\InlineQueryResult\InlineQueryResultPhoto`, see [InlineQueryResultPhoto](https://core.telegram.org/bots/api#inlinequeryresultphoto) for more information.
  * Added object `\TgBotLib\Objects\Telegram\InlineQueryResult\InlineQueryResultGif`, see [InlineQueryResultGif](https://core.telegram.org/bots/api#inlinequeryresultgif) for more information.
+ * Added abstract class `\TgBotLib\Abstracts\ThumbnailMimeType` to represent the mime type of thumbnail, photo, or a file / sticker thumbnail.
 
 ### Changed
  * Refactored InputMessageContent types to its own namespace so InputMessageContent can always return the correct InputMessageContent object type when calling `fromArray()`
diff --git a/src/TgBotLib/Abstracts/ThumbnailMimeType.php b/src/TgBotLib/Abstracts/ThumbnailMimeType.php
new file mode 100644
index 0000000..4c40673
--- /dev/null
+++ b/src/TgBotLib/Abstracts/ThumbnailMimeType.php
@@ -0,0 +1,10 @@
+<?php
+
+    namespace TgBotLib\Abstracts;
+
+    abstract class ThumbnailMimeType
+    {
+        const Jpeg = 'image/jpeg';
+        const Gif = 'image/gif';
+        const Mp4 = 'video/mp4';
+    }
\ No newline at end of file