diff --git a/README.md b/README.md
index c0af268a01df088f43a9b90631aaced93ac90ec7..c64ce9d7861395b31c0357b0692dde4fdb5e701b 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,20 @@ inputs:
 Outputs:
 none
 
+You can also use a credential file as shown in /test:
+```
+credentials = jsondecode(fileread('credentials.json'));
+opts = struct("username", credentials.username, "password",  credentials.password ,"maxDuration", false);
+```
+where the json file is so created:
+```
+{
+    "username":"ygagarin",
+    "password":":YG_password"
+}
+```
+
+
 When the user will succesfully login via the login class method `MatMust_login()` a auth.json file with the authorization tocken will be wrote on your workingdirectory root.  
 
 ### MatMust_logincheck
diff --git a/matlab/test/credentials.json b/matlab/test/credentials.json
deleted file mode 100644
index a9dea5fa7a30591341bea1697cec968bbab4bc34..0000000000000000000000000000000000000000
--- a/matlab/test/credentials.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-	"username":"ygagarin",
-	"password":":YG_password"
-}
\ No newline at end of file