diff --git a/README.md b/README.md
index 4b35544..44e07c2 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Inspired from [shawwwn/uMail](https://github.com/shawwwn/uMail).
 ## Installation
 
 ### Manual
-Copy the `micromail.py` file to your device.
+Copy the `micromail.py` file to your device. You will need to install the `datetime` library as well.
 
 ### MIP
 ```python