diff --git a/apps/document_signatures/managers.py b/apps/document_signatures/managers.py
index 1a20aabe7e..e812f1935f 100644
--- a/apps/document_signatures/managers.py
+++ b/apps/document_signatures/managers.py
@@ -69,3 +69,12 @@ class DocumentVersionSignatureManager(models.Manager):
             document_descriptor.close()
             if detached_signature:
                 detached_signature.close()
+                
+    def clear_detached_signature(self, document):
+        document_signature = self.get_document_signature(document)
+        if not document_signature.signature_file:
+            raise Exception('document doesn\'t have a detached signature')
+
+        document_signature.delete_detached_signature_file()
+        document_signature.signature_file = None
+        document_signature.save()