diff --git a/bin/remind.ml b/bin/remind.ml
index 8b2bbc6..79a2a38 100644
--- a/bin/remind.ml
+++ b/bin/remind.ml
@@ -55,6 +55,7 @@ let empty =
 
 let add_rem b = Buffer.add_string b "REM "
 let add_info b uuid = Buffer.add_string b (spf "INFO \"UID: %s\" " uuid)
+let add_source b source = Buffer.add_string b (spf "INFO \"Calendar: %s\" " (String.uppercase_ascii source))
 let add_date b date = Buffer.add_string b (Timedesc.Date.to_rfc3339 date)
 let add_weekday b wd = Buffer.add_string b (spf "%s " (string_of_weekday wd))
 
@@ -115,6 +116,7 @@ let render_daily rem (d : simple_daily) =
   let b = Buffer.create 256 in
   add_rem b;
   add_info b rem.original_uuid;
+  add_source b rem.source;
   add_date b rem.date;
   Buffer.add_char b ' ';
   add_interval_daily b d;
@@ -130,6 +132,7 @@ let render_weekly rem (w : simple_weekly) =
     (fun wd ->
       add_rem b;
       add_info b rem.original_uuid;
+      add_source b rem.source;
       add_weekday b wd;
       add_date b rem.date;
       Buffer.add_char b ' ';
@@ -145,6 +148,7 @@ let render_single rem =
   let b = Buffer.create 256 in
   add_rem b;
   add_info b rem.original_uuid;
+  add_source b rem.source;
   add_date b rem.date;
   add_at b rem.time;
   add_duration b rem.duration;
@@ -152,11 +156,13 @@ let render_single rem =
   add_msg b rem.summary;
   Buffer.contents b
 
-let render_yearly month day summary =
+let render_yearly rem month day =
   let b = Buffer.create 64 in
   add_rem b;
+  add_info b rem.original_uuid;
+  add_source b rem.source;
   Buffer.add_string b (spf "%s %d" (month_of_int month |> string_of_month) day);
-  add_msg b summary;
+  add_msg b rem.summary;
   Buffer.contents b
 
 (* ── dispatcher ───────────────────────────────────────────────── *)
@@ -169,5 +175,5 @@ let string_of_rem rem =
       | Some w -> render_weekly rem w
       | None -> (
           match rem.yearly with
-          | Some (month, day) -> render_yearly month day rem.summary
+          | Some (month, day) -> render_yearly rem month day
           | None -> render_single rem))