diff --git a/src/app/search/api/router.py b/src/app/search/api/router.py
index 663f4d8..ac20c5c 100644
--- a/src/app/search/api/router.py
+++ b/src/app/search/api/router.py
@@ -50,6 +50,7 @@ def get_params(
         query=body.query or "",
         nb_results=nb_results,
         corpora=tuple(body.corpora) if body.corpora else None,
+        lang=body.lang,
         subject=subject,
         influence_factor=influence_factor,
         relevance_factor=relevance_factor,
diff --git a/src/app/search/models/search.py b/src/app/search/models/search.py
index 41772fb..e8a24c8 100644
--- a/src/app/search/models/search.py
+++ b/src/app/search/models/search.py
@@ -31,11 +31,13 @@ class SDGFilter(BaseModel):
 class SearchQuery(SDGFilter):
     query: str | list[str] | None
     corpora: list[str] | None = None
+    lang: list[str] | None = None
 
 
 class EnhancedSearchQuery(SDGFilter):
     query: str | list[str]
     corpora: tuple[str, ...] | None = None
+    lang: list[str] | None = None
     nb_results: int = 30
     subject: str | None = None
     influence_factor: float = 2
diff --git a/src/app/search/services/search.py b/src/app/search/services/search.py
index 7050519..522a2d0 100644
--- a/src/app/search/services/search.py
+++ b/src/app/search/services/search.py
@@ -267,6 +267,7 @@ async def search_handler(
         )
 
         filter_content = [
+            FilterDefinition(key="document_lang", value=qp.lang),
             FilterDefinition(key="document_corpus", value=qp.corpora),
             FilterDefinition(key="document_details.readability", value=qp.readability),
             FilterDefinition(