diff --git a/README.md b/README.md
index 0bce7c7ec..355037794 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@
* [Implementation details](#implementation-details)
* [Datasets](#datasets)
* [Computing requirements](#computing-requirements)
+* [Known limitations](#limitations)
* [References](#references)
@@ -361,6 +362,16 @@ Prediction: Once trained, prediction using MEGNet models are fairly cheap.
For example, the http://megnet.crystals.ai web app runs on a single hobby dyno
on Heroku and provides the prediction for any crystal within seconds.
+
+# Known limitations
+
+- `isolated atoms` error. This error occurs when using the given cutoff in the model (4A in
+2018 models and 5A for 2019 models), the crystal structure contains isolated atoms, i.e.,
+no neighboring atoms are within the distance of `cutoff`. Most of the time, we can just
+discard the structure, since we found that those structures tend to have a high energy above
+hull (less stable). If you find this error becomes an essential issue for a particular problem,
+feel free to email us and we will consider release a new model with increased cutoff.
+
# References