diff --git a/packages/shared-python/shared/services/ai/token_costing.py b/packages/shared-python/shared/services/ai/token_costing.py
index 190628f68..cdc1fafb9 100644
--- a/packages/shared-python/shared/services/ai/token_costing.py
+++ b/packages/shared-python/shared/services/ai/token_costing.py
@@ -14,7 +14,9 @@
 
 DEFAULT_TOKEN_PRICING_TABLE: dict[str, dict[str, Any]] = {
     # DeepSeek official (peak/off-peak since 2026-08-16 16:00 UTC).
-    # Defaults use OFF-PEAK; peak rates are 2x (01:00-04:00 & 06:00-10:00 UTC).
+    # Defaults use OFF-PEAK; peak rates are 2x and run 01:00-04:00 & 06:00-10:00 UTC,
+    # Monday through Friday, excluding Chinese public holidays.
+    # Weekends and Chinese public holidays are off-peak all day.
     "deepseek-v4-flash": {
         "currency": "USD",
         "unit": "per_1m_tokens",