diff --git a/app/src/main/res/values-cy/strings.xml b/app/src/main/res/values-cy/strings.xml
index a358c83fa..c1e50db54 100644
--- a/app/src/main/res/values-cy/strings.xml
+++ b/app/src/main/res/values-cy/strings.xml
@@ -180,6 +180,8 @@
     <!-- Browser menu button to configure reader mode appearance e.g. the used font type and size -->
     <string name="browser_menu_read_appearance">Gwedd</string>
 
+    <!-- Browser menu button to show reader view appearance controls e.g. the used font type and size -->
+    <string name="browser_menu_customize_reader_view">Cyfaddasu’r golwg defnyddiwr</string>
     <!-- Error message to show when the user tries to access a scheme not
         handled by the app (Ex: blob, tel etc) -->
     <string name="unknown_scheme_error_message">Methu cysylltu. Cynllun URL anadnabyddadwy.</string>