diff --git a/src/strings/cy.json b/src/strings/cy.json
index 389d24e0b..4c21c1f09 100644
--- a/src/strings/cy.json
+++ b/src/strings/cy.json
@@ -84,7 +84,7 @@
     "ButtonMore": "Mwy",
     "ButtonInfo": "Gwybodaeth",
     "ButtonFullscreen": "Sgrin lawn",
-    "ButtonCast": "Darlledu",
+    "ButtonCast": "Darlledu'r cyfrwng",
     "ButtonCancel": "Canslo",
     "ButtonBack": "Yn ôl",
     "ButtonArrowRight": "Dde",