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 ## 1.2.0 (Unreleased)
 
+NEW FEATURES:
+
+* `precondition` and `postcondition` check blocks for resources, data sources, and module output values: module authors can now document assumptions and assertions about configuration and state values. If these conditions are not met, Terraform will report a custom error message to the user and halt further evaluation.
+
 ENHANCEMENTS:
 
 * The "Invalid for_each argument" error message for unknown maps/sets now includes an additional paragraph to try to help the user notice they can move apply-time values into the map _values_ instead of the map _keys_, and thus avoid the problem without resorting to `-target`. [GH-30327]