diff --git a/README.rst b/README.rst
index fa95cc22..ee9e604d 100644
--- a/README.rst
+++ b/README.rst
@@ -179,6 +179,8 @@ Traps for new players
 
 1. Terms and Conditions during ticket purchase workflow are implemented by having a product category called something like "Terms & Conditions" with a product called "I accept". See `settings.TERMS_PRODUCT_CATEGORY` and `pinaxcon/registrasion/management/commands/populate_inventory.py`. 
 
+2. If *any* flag or voucher enables a category or product, that category or product will become disabled by default.
+
 
 Issues
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