diff --git a/README.md b/README.md
index 522dd60..612b9b4 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Tell people how to cite this software.
 * Use a specific BibTeX entry for the software?
 
 
-    @Manual{
+    @Manual{,
         title = {Accounting Service},
         author = {{Frosini, Luca}, {Cirillo, Roberto}},
         organization = {ISTI - CNR},