Update README.md

README.md

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 - **end_text**: The textual representation of the ending concept or the external URL in the relationship.
 
+- **surfaceText**: A human-readable sentence or phrase that illustrates the relationship between the `start_text` and `end_text` concepts. It often contains placeholders like `[start]` and `[end]` which can be replaced with the actual terms to form a coherent statement.
+
 - **start_uri**: The unique URI identifier for the starting concept.
 
 - **relation_uri**: The unique URI identifier for the type of relationship. This URI can be used to understand the nature of the relationship. For a comprehensive list of relation types and their meanings, refer to [ConceptNet's Relation Types Documentation](https://github.com/commonsense/conceptnet5/wiki/Relations).