diff --git a/services/web/app/src/infrastructure/mongodb.mjs b/services/web/app/src/infrastructure/mongodb.mjs
index 1032f0da83..d58dcbf000 100644
--- a/services/web/app/src/infrastructure/mongodb.mjs
+++ b/services/web/app/src/infrastructure/mongodb.mjs
@@ -54,6 +54,7 @@ export const db = {
   groupAuditLogEntries: internalDb.collection('groupAuditLogEntries'),
   institutions: internalDb.collection('institutions'),
   libraryReferences: internalDb.collection('libraryReferences'),
+  librarySizes: internalDb.collection('librarySizes'),
   librarySyncStates: internalDb.collection('librarySyncStates'),
   messages: internalDb.collection('messages'),
   migrations: internalDb.collection('migrations'),
diff --git a/services/web/locales/en.json b/services/web/locales/en.json
index 78aac6ab39..13a75ff55f 100644
--- a/services/web/locales/en.json
+++ b/services/web/locales/en.json
@@ -1443,7 +1443,10 @@
   "lets_get_you_set_up": "Let’s get you set up.",
   "libraries": "Libraries",
   "library": "Library",
+  "library_entry_too_large": "This entry is too large to add. Library entries can be up to __limit__. Try trimming the entry and adding it again.",
   "library_in_labs": "Library is in Labs — tell us what you think.",
+  "library_size_limit_reached": "Your library has reached its size limit of __limit__. Remove some references before adding more.",
+  "library_too_many_references": "Your library has reached its limit of __limit__ references. Remove some references before adding more.",
   "license": "License",
   "license_allocated": "License allocated",
   "license_not_allocated": "License not allocated",