diff --git a/Cropping-ignored.md b/Cropping-ignored.md
new file mode 100644
index 0000000..5196160
--- /dev/null
+++ b/Cropping-ignored.md
@@ -0,0 +1,19 @@
+# Cropping parameter are ignored, or cropping is done but with wrong dimensions
+
+## The problem
+
+You merge a video track applying cropping parameters. When you play the file back the video is either unchanged (no cropping applied at all) or the dimensions are wrong.
+
+## Reason
+
+This is a bug in your player. There's unfortunately no easy way around it.
+
+In Matroska the cropping parameters are stored as four values (top, left, bottom, right) in the track headers. The video track itself is not modified. It's therefore a lossless process.
+
+During playback it's the player's job to set up video filters properly so that the cropping parameters are honored. The [Matroska spec notes page](http://www.matroska.org/technical/specs/notes.html#Cropping) lists the process to use:
+
+> PixelXXX (size of the coded image) -> PixelCropXXX (size of the image to keep) -> DisplayXXX (resized cropped image)
+
+You should report this bug to the developers of your player.
+
+Categories: [merging](Category-merging), [playback](Category-playback)