diff --git a/tracetools_analysis/analysis/data_model.py b/tracetools_analysis/analysis/data_model.py
index 18d283a..2f46c54 100644
--- a/tracetools_analysis/analysis/data_model.py
+++ b/tracetools_analysis/analysis/data_model.py
@@ -5,9 +5,11 @@ import pandas as pd
 
 class DataModel():
     """
-    Container to model processed data.
+    Container to model pre-processed data for analysis.
 
-    Contains data for an analysis to use.
+    Contains data for an analysis to use. This is a middleground between trace events data and the
+    output data of an analysis. This aims to represent the data in a ROS-aware way.
+    It uses pandas DataFrames directly.
     """
 
     def __init__(self):