diff --git a/Simulating-events-from-a-video.md b/Simulating-events-from-a-video.md
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--- a/Simulating-events-from-a-video.md
+++ b/Simulating-events-from-a-video.md
@@ -1,5 +1,10 @@
 In this tutorial, we will show how to use ESIM to simulate events from a given video.
 
+### WARNING
+
+Simulating events from a video will not work for any video. The input video needs to have a sufficiently high framerate: the pixel displacement between successive images needs to be small (i.e. a few pixels at most).
+Otherwise, the simulated events will be of poor quality.
+
 ### Overview
 
 An overview of the conversion method is shown in the diagram below. First, we will extract the individual frames from the input video in a folder. Second, we will run ESIM, providing the image folder as an input to simulate events.