diff --git a/Performance/Dealing with large data files.ipynb b/Performance/Dealing with large data files.ipynb
index 623b8a9..1010d93 100644
--- a/Performance/Dealing with large data files.ipynb	
+++ b/Performance/Dealing with large data files.ipynb	
@@ -54,7 +54,7 @@
    "source": [
     "## Data preparation\n",
     "\n",
-    "Now we simulate and load a full dataset. Let's simulate a large observation, about 2GB"
+    "Now we simulate and load a full dataset. Let's simulate a large observation, about 2GB. We use HENDRICS, you can install it with `pip install hendrics`"
    ]
   },
   {