diff --git a/src/ptbench/data/padchest/tb_idiap.py b/src/ptbench/data/padchest/tb_idiap.py
index 69c2708b6872c6a2dbc3a71ab88d2d41b9e4c5e1..ddfa889ffc1c231fa708b4a09a94ba3315f7cae3 100644
--- a/src/ptbench/data/padchest/tb_idiap.py
+++ b/src/ptbench/data/padchest/tb_idiap.py
@@ -9,7 +9,8 @@ datamodule = DataModule("tb-idiap.json")
 
 This split contains 125 healthy images are the first 125 padchest images with
 the following parameters: Label = "Normal", MethodLabel = "Physician",
-Projection = "PA"
+Projection = "PA" and TB cases.  Labelling matches those for active TB (binary)
+classification datasets.
 
 Read documentation of :py:class:`DataModule` for technical details.
 """