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 ## Documentation
 
 [The STIX 2.1 Ontology](./docs/ontologies/stix/stix-ontology-readme.md)
+[The TAC Ontology](./docs/ontologies/tac/tac-ontology-readme.md)
+[The TAL Ontology](./docs/ontologies/tal/tal-ontology-readme.md)
 	
 
 ## <a id="maintainers">Maintainers</a>
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+# The Threat Actor Context (TAC) Ontology 
+
+## TAC Ontology
+The TAC Ontology is an extension of the STIX 2.1 Ontology (aka stix.owl).
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+# The Threat Agent Library
+
+## The TAL Ontology 
+The Threat Agent Library is a contribution from Intel Corp. It is an extension of the TAC Ontology. As stated before:
+
+### STIX 2.1 Standard Specification is extended by the STIX Ontology (stix.owl)
+### STIX Ontology is extended by the TAC Ontology (tac.owl)
+### TAC Ontology is extended by the TAL Ontology (ta-library.owl)
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