diff --git a/services/web/frontend/extracted-translations.json b/services/web/frontend/extracted-translations.json
index b3b150f906..b462dd70cb 100644
--- a/services/web/frontend/extracted-translations.json
+++ b/services/web/frontend/extracted-translations.json
@@ -295,6 +295,7 @@
   "choose_which_experiments": "",
   "choose_word_document": "",
   "citation": "",
+  "citation_key_autogenerate_helper": "",
   "citation_key_helper": "",
   "cite_a_reference_from_your_reference_manager_to_automatically_add_it_to_your_bib_file": "",
   "cite_directly_or_import_references": "",
diff --git a/services/web/locales/en.json b/services/web/locales/en.json
index 4c807ede00..d58c8cce39 100644
--- a/services/web/locales/en.json
+++ b/services/web/locales/en.json
@@ -382,6 +382,7 @@
   "choose_word_document": "Choose Word document",
   "choose_your_plan": "Choose your plan",
   "citation": "Citation",
+  "citation_key_autogenerate_helper": "Auto-generated from the author and year, if left blank",
   "citation_key_helper": "Unique key for citations, no spaces or special characters",
   "cite_a_reference_from_your_reference_manager_to_automatically_add_it_to_your_bib_file": "Cite a reference from your reference manager to automatically add it to your .bib file.",
   "cite_directly_or_import_references": "Cite directly or import references",
diff --git a/tools/migrations/20260717120000_create_libraryReferences_key_index.mjs b/tools/migrations/20260717120000_create_libraryReferences_key_index.mjs
new file mode 100644
index 0000000000..c4e47c5ccf
--- /dev/null
+++ b/tools/migrations/20260717120000_create_libraryReferences_key_index.mjs
@@ -0,0 +1,28 @@
+import Helpers from './lib/helpers.mjs'
+
+const tags = ['saas', 'auxiliary']
+
+// Backs an exact/prefix-range lookup on the raw citation key, used to suggest
+// a unique citation key when auto-generating one from author/year.
+const newIndexes = [
+  {
+    key: { userId: 1, key: 1 },
+    name: 'userId_1_key_1',
+  },
+]
+
+const migrate = async client => {
+  const { db } = client
+  await Helpers.addIndexesToCollection(db.libraryReferences, newIndexes)
+}
+
+const rollback = async client => {
+  const { db } = client
+  await Helpers.dropIndexesFromCollection(db.libraryReferences, newIndexes)
+}
+
+export default {
+  tags,
+  migrate,
+  rollback,
+}