diff --git a/src/search.rs b/src/search.rs
index 529a1adb..0eae94c0 100644
--- a/src/search.rs
+++ b/src/search.rs
@@ -349,6 +349,16 @@ pub struct SearchQuery<'a, Http: HttpClient> {
 
     #[serde(skip_serializing_if = "Option::is_none")]
     pub(crate) index_uid: Option<&'a str>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub(crate) federation_options: Option<QueryFederationOptions>,
+}
+
+#[derive(Debug, Serialize, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct QueryFederationOptions {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub weight: Option<f32>,
 }
 
 #[allow(missing_docs)]
@@ -380,6 +390,7 @@ impl<'a, Http: HttpClient> SearchQuery<'a, Http> {
             index_uid: None,
             distinct: None,
             ranking_score_threshold: None,
+            federation_options: None,
         }
     }
     pub fn with_query<'b>(&'b mut self, query: &'a str) -> &'b mut SearchQuery<'a, Http> {
@@ -583,6 +594,14 @@ impl<'a, Http: HttpClient> SearchQuery<'a, Http> {
         self.ranking_score_threshold = Some(ranking_score_threshold);
         self
     }
+    /// Only usable in federated multi search queries.
+    pub fn with_federation_options<'b>(
+        &'b mut self,
+        federation_options: QueryFederationOptions,
+    ) -> &'b mut SearchQuery<'a, Http> {
+        self.federation_options = Some(federation_options);
+        self
+    }
     pub fn build(&mut self) -> SearchQuery<'a, Http> {
         self.clone()
     }