diff --git a/rag/pipelines/emit_manifest.py b/rag/pipelines/emit_manifest.py
index a5d0cc7..91e2e3e 100644
--- a/rag/pipelines/emit_manifest.py
+++ b/rag/pipelines/emit_manifest.py
@@ -41,10 +41,11 @@
 
 logger = logging.getLogger(__name__)
 
-# Hardcoded; ``rag.embeddings.embed_*`` defaults to voyage-3-lite (1024d).
+# Hardcoded; ``rag.embeddings.embed_*`` defaults to voyage-3-lite (512d,
+# matches the ``embedding vector(512)`` column in ``rag/schema.sql``).
 # Surfaced in the manifest so consumers don't have to re-derive it.
 _EMBEDDING_MODEL = "voyage-3-lite"
-_EMBEDDING_DIMENSION = 1024
+_EMBEDDING_DIMENSION = 512
 
 
 def _by_source() -> dict[str, dict[str, int]]:
diff --git a/tests/test_emit_manifest.py b/tests/test_emit_manifest.py
index 9e261bd..8234ac4 100644
--- a/tests/test_emit_manifest.py
+++ b/tests/test_emit_manifest.py
@@ -86,7 +86,9 @@ def test_coverage_percentiles(manifest):
 
 
 def test_embedding_metadata(manifest):
-    assert manifest["embedding"] == {"model": "voyage-3-lite", "dimension": 1024}
+    # voyage-3-lite is 512d — matches `embedding vector(512)` in the lib's
+    # rag/schema.sql. pgvector enforces dim on INSERT.
+    assert manifest["embedding"] == {"model": "voyage-3-lite", "dimension": 512}
 
 
 def test_ingestion_overall_picks_max(manifest):