diff --git a/docs/specification.md b/docs/specification.md
index 9335bd1c5..848c9545c 100644
--- a/docs/specification.md
+++ b/docs/specification.md
@@ -43830,7 +43830,7 @@ All domain models, configuration objects, and API schemas use **Pydantic V2** (>
 
 #### Domain Models
 
-Every domain entity — Plan, Decision, Action, Resource, Actor, Tool, Skill, Session, Invariant, AutomationProfile, Checkpoint, CorrectionAttempt — is a Pydantic `BaseModel` subclass. Fields use Python type annotations with Pydantic field validators for business rule enforcement.
+Every domain entity — Plan, Decision, Action, Resource, Actor, Tool, Skill, Session, Invariant, AutomationProfile, Checkpoint, CorrectionAttempt — is a Pydantic model subclass. Domain entities that share the canonical configuration (`str_strip_whitespace`, `validate_assignment`, `arbitrary_types_allowed=False`, `populate_by_name`, `use_enum_values`) inherit from the shared `DomainBaseModel` base class (defined in `domain/models/base.py`) rather than directly from `pydantic.BaseModel`. Classes with genuinely different configuration requirements may still subclass `BaseModel` directly. Fields use Python type annotations with Pydantic field validators for business rule enforcement.
 
 #### Configuration Objects