diff --git a/src/handlers/handler_calendar_by_id.erl b/src/handlers/handler_calendar_by_id.erl
index 009623c..fdcec73 100644
--- a/src/handlers/handler_calendar_by_id.erl
+++ b/src/handlers/handler_calendar_by_id.erl
@@ -181,6 +181,10 @@ convert_calendar_fields(Updates) ->
 convert_field({<<"title">>, Val})        -> {title, Val};
 convert_field({<<"description">>, Val})  -> {description, Val};
 convert_field({<<"type">>, Val})         -> {type, Val};
+convert_field({<<"confirmation">>, <<"auto">>})   -> {confirmation, auto};
+convert_field({<<"confirmation">>, <<"manual">>}) -> {confirmation, manual};
+convert_field({<<"confirmation">>, #{<<"timeout">> := N}}) when is_integer(N), N > 0 ->
+  {confirmation, {timeout, N}};
 convert_field({<<"confirmation">>, Val}) -> {confirmation, Val};
 convert_field({<<"tags">>, Val})         -> {tags, Val};
 convert_field(Other)                     -> Other.
\ No newline at end of file