diff --git a/src/stamp/config.yaml b/src/stamp/config.yaml
index 21ac06b3..aef9fefb 100644
--- a/src/stamp/config.yaml
+++ b/src/stamp/config.yaml
@@ -61,7 +61,7 @@ crossval:
   # containing the feature file path relative to `feature_dir`.
   # Patient IDs not present in the clini table
   # as well as non-existent feature paths
-  # are ignored.
+  # are ignored. NOTE: Don't forget to add the .h5 file extension.
   slide_table: "/path/of/slide.csv"
 
   # Name of the column from the clini table to train on.
@@ -114,7 +114,7 @@ training:
   # containing the feature file path relative to `feature_dir`.
   # Patient IDs not present in the clini table
   # as well as non-existent feature paths
-  # are ignored.
+  # are ignored. NOTE: Don't forget to add the .h5 file extension.
   slide_table: "/path/of/slide.csv"
 
   # Name of the column from the clini table to train on.
@@ -155,7 +155,7 @@ deployment:
   # containing the patient ID (matching those in the `clini_table`), and one
   # called "FILENAME", containing the feature file path relative to `feature_dir`.
   # Patient IDs not present in the clini table as well as non-existent feature
-  # paths are ignored.
+  # paths are ignored. NOTE: Don't forget to add the .h5 file extension.
   slide_table: "/path/of/slide.csv"
 
   # Name of the column from the clini to compare predictions to.