diff --git a/README.md b/README.md
index eaa2180..3905491 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@
 7. Designed to be thread safe & null safe  
 8. Rich API  
 9. Fully documented, just run java docs!  
+10. Thread safe
   
 # Vocabulary