diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3585b0bb..2064e8c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@
- Ability to skip processing of some formats. See [Skip processing](https://docs.imgproxy.net/#/configuration?id=skip-processing).
- (pro) [video_thumbnail_second](https://docs.imgproxy.net/#/generating_the_url_advanced?id=video-thumbnail-second) processing option.
- (pro) [background_alpha](https://docs.imgproxy.net/#/generating_the_url_advanced?id=background-alpha) processing option.
+- (pro) `IMGPROXY_VIDEO_THUMBNAIL_PROBE_SIZE` and `IMGPROXY_VIDEO_THUMBNAIL_MAX_ANALYZE_DURATION` configs.
+
+### Changed
+- Speed up generation of video thumbnails with large timestamps.
+
+### Fix
+- Fix thumbnails generation of some videos.
## [2.14.1] - 2020-07-22
### Fix
diff --git a/docs/configuration.md b/docs/configuration.md
index 241a276d..df454cc0 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -144,6 +144,10 @@ imgproxy Pro can extract specific frames of videos to create thumbnails. The fea
* `IMGPROXY_ENABLE_VIDEO_THUMBNAILS`:
then true, enables video thumbnails generation. Default: false;
* `IMGPROXY_VIDEO_THUMBNAIL_SECOND`:
the timestamp of the frame in seconds that will be used for a thumbnail. Default: 1.
+* `IMGPROXY_VIDEO_THUMBNAIL_PROBE_SIZE`:
the maximum amount of bytes used to determine the format. Lower values can decrease memory usage but can produce inaccurate data or even lead to errors. Default: 5000000.
+* `IMGPROXY_VIDEO_THUMBNAIL_MAX_ANALYZE_DURATION`:
the maximum of milliseconds used to get the stream info. Low values can decrease memory usage but can produce inaccurate data or even lead to errors. When set to 0, the heuristic is used. Default: 0.
+
+**⚠️Warning:** Though using `IMGPROXY_VIDEO_THUMBNAIL_PROBE_SIZE` and `IMGPROXY_VIDEO_THUMBNAIL_MAX_ANALYZE_DURATION` can lower the memory footprint of video thumbnails generation, you should use them in production only when you know what are you doing.
## Watermark