diff --git a/README.md b/README.md
index 908ffe61..3566b81d 100644
--- a/README.md
+++ b/README.md
@@ -901,7 +901,7 @@ Pinakes v0.7.x introduced a full library-interoperability layer, delivered as op
 
 - Collane now support an optional umbrella group for related spin-offs, universes, or franchises, so separate series like `Fairy Tail`, `Fairy Tail: 100 Year Quest`, and `Fairy Tail: Happy` can remain distinct while sharing one parent group.
 - Collane also support an optional cycle/season label plus numeric ordering, matching LibraryThing-style series such as `The Worlds of Aldebaran` with `Cycle 1`, `Cycle 2`, and later arcs.
-- Book create/edit forms can set group, cycle/season, cycle order, series name, and series number in one flow; the Collane admin page exposes the same metadata and shows related series in the same group.
+- Book create/edit forms can set group, cycle/season, cycle order, series name, and number in series in one flow; the Collane admin page exposes the same metadata and shows related series in the same group.
 
 ### Archives plugin (ISAD(G) / ISAAR(CPF))
 
diff --git a/app/Controllers/CsvImportController.php b/app/Controllers/CsvImportController.php
index 3aa353e6..b5163a55 100644
--- a/app/Controllers/CsvImportController.php
+++ b/app/Controllers/CsvImportController.php
@@ -1099,7 +1099,7 @@ private function mapColumnHeaders(array $headers): array
             'prezzo' => ['prezzo', 'price', 'precio', 'prix', 'preis', 'list price', 'purchase price'],
             'copie_totali' => ['copie_totali', 'copie', 'copies', 'quantity', 'quantità', 'cantidad'],
             'collana' => ['collana', 'series', 'collection', 'collections', 'colección', 'reihe'],
-            'numero_serie' => ['numero_serie', 'series number', 'número de serie', 'numéro de série'],
+            'numero_serie' => ['numero_serie', 'number in series', 'número de serie', 'numéro de série'],
             'traduttore' => ['traduttore', 'translator', 'traductor', 'traducteur', 'übersetzer'],
             'illustratore' => ['illustratore', 'illustrator', 'ilustrador', 'illustrateur', 'zeichner'],
             'parole_chiave' => ['parole_chiave', 'parole chiave', 'keywords', 'tags', 'palabras clave', 'mots-clés', 'schlagwörter', 'subjects'],
diff --git a/locale/en_US.json b/locale/en_US.json
index 7c092157..ec04ba2b 100644
--- a/locale/en_US.json
+++ b/locale/en_US.json
@@ -3218,7 +3218,7 @@
   "Numero Inventario": "Inventory Number",
   "Numero Libri": "Number of Books",
   "Numero Pagine": "Number of Pages",
-  "Numero Serie": "Series Number",
+  "Numero Serie": "Number in Series",
   "Numero colonne non valido": "Invalid column count",
   "Numero di Pagine": "Number of Pages",
   "Numero di copie non valido.": "Invalid number of copies.",
@@ -3228,7 +3228,7 @@
   "Numero massimo di righe superato (%d). Dividi il file in parti più piccole.": "Maximum number of rows exceeded (%d). Split the file into smaller parts.",
   "Numero o descrizione dell'edizione": "Edition number or description",
   "Numero prenotazioni attive": "Number of active reservations",
-  "Numero serie": "Series number",
+  "Numero serie": "Number in series",
   "Numero tessera": "Card number",
   "Numero volume": "Volume number",
   "Nuova Collana": "New Series",