Update README.md

Author: chrisgdt

README.md

@@ -151,6 +151,10 @@ To manipulate the dataset, you can use `python/` folder, here is a short descrip
 For the dataset usage in the training itself, unzip the file `dataset.tar.gz` to obtain multiple data folder inside
 `python/`, then run `parseSample.py` to get `sessions.json` (for normal training) and `sessions_human_only.json` (for GAN).
 
+⚠️ The dataset is relatively limited: it contains only a small set of human trajectories, along with
+trajectories generated by different algorithms / programs created for that purpose or found online.
+
+
 ### Example
 
 The code of a basic training looks like this :