diff --git a/include/elasticlient/bulk.h b/include/elasticlient/bulk.h
index 2598d8c..fd3a7c8 100644
--- a/include/elasticlient/bulk.h
+++ b/include/elasticlient/bulk.h
@@ -85,6 +85,17 @@ class SameIndexBulkData: public IBulkData {
             const std::string &docType, const std::string &id,
             const std::string &doc);
 
+    /**
+     * Add update document request to the bulk.
+     * \param docType document type (as specified in mapping).
+     * \param id document ID.
+     * \param doc Json document to index. Must not contain newline char.
+     * \return true if bulk has reached its desired capacity.
+     */
+    bool updateDocument(
+            const std::string &docType, const std::string &id,
+            const std::string &doc);
+
     /// Clear bulk (size() == 0 after this).
     void clear();
 
diff --git a/src/bulk.cc b/src/bulk.cc
index a9f659d..4785a7d 100644
--- a/src/bulk.cc
+++ b/src/bulk.cc
@@ -68,6 +68,15 @@ bool SameIndexBulkData::createDocument(
     return impl->data.size() >= impl->size;
 }
 
+bool SameIndexBulkData::updateDocument(
+        const std::string &docType, const std::string &id, const std::string &doc)
+{
+    validateDocument(doc, id);
+    impl->data.emplace_back(createControl("update", docType, id), doc);
+    // return true if bulk has reached its desired capacity
+    return impl->data.size() >= impl->size;
+}
+
 
 void SameIndexBulkData::clear() {
     impl->data.resize(0);