diff --git a/README.md b/README.md
index 09e75b2..46321d2 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,7 @@ The only system call required to be implemented in any ESOP-compatible runtime i
 - sending DTMF signals during active voice calls;
 - active voice call manipulation (terminate, hold/unhold, bridge); 
 - sending SMS messages;
+- sending USSD queries;
 - polling for incoming SMS messages;
 - polling for incoming USSD messages;
 - polling for incoming WEA messages;