diff --git a/references/list.json b/references/list.json
index 1a4fb26f..c2ac6300 100644
--- a/references/list.json
+++ b/references/list.json
@@ -992,6 +992,7 @@
     "Exploratory laparotomy",
     "Fine needle aspiration biopsy",
     "Gastric Antrectomy",
+    "Hemithyroidectomy",
     "Hepaticojejunostomy",
     "Ivor Lewis subtotal esophagectomy",
     "Laparotomy (Open and Shut)",
@@ -1002,6 +1003,7 @@
     "McKeown esophagectomy",
     "Merendino procedure",
     "Minimally invasive esophagectomy",
+    "Near-total thyroidectomy",
     "Pancreaticoduodenectomy",
     "Pancreaticojejunostomy, side-to-side anastomosis",
     "Pneumonectomy",
@@ -1014,10 +1016,12 @@
     "Spleen preserving distal pancreatectomy",
     "Splenectomy",
     "Subtotal pancreatectomy",
+    "Subtotal thyroidectomy",
     "Thoracotomy (Open & Shut)",
     "Total gastrectomy",
     "Total gastrectomy with extended lymphadenectomy",
     "Total pancreatectomy",
+    "Total thyroidectomy",
     "Transhiatal esophagectomy",
     "Triple bypass of pancreas",
     "Wedge/localised gastric resection",