1 files changed, 11 insertions, 0 deletions
diff --git a/Firestore/Source/Model/FSTDocumentKey.h b/Firestore/Source/Model/FSTDocumentKey.h
index a403117..ebc88c9 100644
--- a/Firestore/Source/Model/FSTDocumentKey.h
+++ b/Firestore/Source/Model/FSTDocumentKey.h
@@ -21,6 +21,15 @@
 
 #include "Firestore/core/src/firebase/firestore/model/resource_path.h"
 
+// Using forward declaration to avoid circular dependency (`document_key.h` includes this header).`
+namespace firebase {
+namespace firestore {
+namespace model {
+class DocumentKey;
+}
+}
+}
+
 NS_ASSUME_NONNULL_BEGIN
 
 /** FSTDocumentKey represents the location of a document in the Firestore database. */
@@ -33,6 +42,8 @@ NS_ASSUME_NONNULL_BEGIN
  * @return A new instance of FSTDocumentKey.
  */
 + (instancetype)keyWithPath:(firebase::firestore::model::ResourcePath)path;
+
++ (instancetype)keyWithDocumentKey:(const firebase::firestore::model::DocumentKey &)documentKey;
 /**
  * Creates and returns a new document key with a path with the given segments.
  *