diff --git a/README.md b/README.md
index 88da36d..92b498e 100644
--- a/README.md
+++ b/README.md
@@ -150,6 +150,13 @@ Running tests is as simple as
   python test.py
 ```
 
+Test will print few error messages, like so
+```
+Testing started at 9:31 AM ...
+  tag digest not found: 400
+error 400
+```
+this is ok, because test simulates invalid inputs also. 
 
 # Contact