add description

README.md

@@ -50,19 +50,22 @@ This is a large corpus of 41,578 preprocessed sms spam messages and emails sent
 
 <br>
 
-### Some preprcoessing algorithms
+## Some preprcoessing algorithms
 - [spam_assassin.js](./spam_assassin.js), followed by [spam_assassin.py](./spam_assassin.py)
 - [enron_spam.py](./enron_spam.py)
 
-<br>
 
-### Data composition
+## Data composition
 ![](./spam_counts.png)
 
+## Description
+To make the text format between sms messages and emails consistent, email subjects and content are separated by two newlines:
 
-<br>
+```python
+text = email.subject + "\n\n" + email.content
+```
 
-### Original source
+## Original source
 - https://huggingface.co/datasets/sms_spam
 - https://github.com/MWiechmann/enron_spam_data
 - https://github.com/stdlib-js/datasets-spam-assassin