diff --git a/python/ray/rllib/models/catalog.py b/python/ray/rllib/models/catalog.py
index b611d2e31..71e181d10 100644
--- a/python/ray/rllib/models/catalog.py
+++ b/python/ray/rllib/models/catalog.py
@@ -21,7 +21,8 @@ from ray.rllib.models.multiagentfcnet import MultiAgentFullyConnectedNetwork
 
 MODEL_CONFIGS = [
     # === Built-in options ===
-    "conv_filters",  # Filter configuration
+    # Filter config. List of [out_channels, kernel, stride] for each filter
+    "conv_filters",
     "conv_activation",  # Nonlinearity for built-in convnet
     "fcnet_activation",  # Nonlinearity for fully connected net (tanh, relu)
     "fcnet_hiddens",  # Number of hidden layers for fully connected net