Add citation ref to passage-entity (no link)

README.md

@@ -36,11 +36,7 @@ pip install -r requirements.txt
 # 2. Set your OpenAI API key (required for LLM and answer generation)
 export OPENAI_API_KEY="sk-..."
 
-# 3. KGs are already included (no download needed when cloned from HuggingFace)
-#    If cloned from GitHub, download KGs:
-#    huggingface-cli download tarzanagh/QAFD-RAG --include "kg/multihop/*" --local-dir .
-
-# (Original step 3: Download pre-built KGs (recommended — saves hours of build time + API costs)
+# 3. Download pre-built KGs (recommended — saves hours of build time + API costs)
 huggingface-cli download tarzanagh/QAFD-RAG --include "kg/multihop/*" --local-dir .
 huggingface-cli download tarzanagh/QAFD-RAG --include "kg/ultradomain/*" --local-dir .
 
@@ -62,7 +58,7 @@ QAFD-RAG supports two knowledge graph representations, both using the same Query
 
 | | **Entity Graph** | **Passage-Entity Graph** |
 |---|---|---|
-| **Nodes** | Entities + relationships | Entities + passages + facts |
+| **Nodes** | Entities + relationships | Entities + passages + facts (Gutiérrez et al., 2024) |
 | **Extraction** | LLM entity/relationship extraction | OpenIE (NER + triple extraction) |
 | **Edges** | Entity-entity relationships | Fact edges + passage edges + synonymy edges |
 | **QAFD traversal** | Flow reaches entities, passages looked up after | Flow reaches passages directly as graph nodes |