diff --git a/lightrag/prompt.py b/lightrag/prompt.py
index 570ea7b8..8b1112f5 100644
--- a/lightrag/prompt.py
+++ b/lightrag/prompt.py
@@ -21,7 +21,7 @@ Use {language} as output language.
 1. Identify all entities. For each identified entity, extract the following information:
 - entity_name: Name of the entity, use same language as input text. If English, capitalized the name.
 - entity_type: One of the following types: [{entity_types}]
-- entity_description: Comprehensive description of the entity's attributes and activities
+- entity_description: Provide a comprehensive description of the entity's attributes and activities *based solely on the information present in the input text*. **Do not infer or hallucinate information not explicitly stated.** If the text provides insufficient information to create a comprehensive description, state "Description not available in text."
 Format each entity as ("entity"{tuple_delimiter}<entity_name>{tuple_delimiter}<entity_type>{tuple_delimiter}<entity_description>)
 
 2. From the entities identified in step 1, identify all pairs of (source_entity, target_entity) that are *clearly related* to each other.