diff --git a/components/admin/guide-section-editor.tsx b/components/admin/guide-section-editor.tsx
index 22880e6..8eafa59 100644
--- a/components/admin/guide-section-editor.tsx
+++ b/components/admin/guide-section-editor.tsx
@@ -229,6 +229,7 @@ const teamMemberApplyOptions = [
 ] as const satisfies readonly (readonly [TeamMemberApplyField, string])[];
 const multipleApplyStorageKey = (guideId: string) =>
   `buzz-sheet:team-multiple-apply:${guideId}`;
+const DEFAULT_CONSTELLATION_CONDITION_NOTE = "C0 = 100%";
 type Guide = {
   id: string;
   characterKey: string;
@@ -2495,7 +2496,7 @@ function ConstellationEditor({
   const [groups, setGroups] = useState(() => {
     const source = initial.constellationGroups.length
       ? initial.constellationGroups
-      : [{ id: "constellation-condition-default", name: null, note: null, rows: [] }];
+      : [{ id: "constellation-condition-default", name: null, note: DEFAULT_CONSTELLATION_CONDITION_NOTE, rows: [] }];
     return source.map((group) => ({
       clientId: group.id,
       name: group.name ?? "",
@@ -2581,7 +2582,7 @@ function ConstellationEditor({
               {
                 clientId: createClientId("constellation-condition"),
                 name: "",
-                note: "",
+                note: DEFAULT_CONSTELLATION_CONDITION_NOTE,
                 rows: makeRows(),
               },
             ]);