diff --git a/core/constants.py b/core/constants.py
index 762cd39..3ae503a 100644
--- a/core/constants.py
+++ b/core/constants.py
@@ -177,6 +177,7 @@ DATA_MODES = [
     "JS8",
     "HELL",
     "PSK",
+    "FSK",
     "OLIVIA",
     "PKT",
     "MSK144",