diff --git a/linkcheck/checker/unknownurl.py b/linkcheck/checker/unknownurl.py
index a60f1408..f02ff97c 100644
--- a/linkcheck/checker/unknownurl.py
+++ b/linkcheck/checker/unknownurl.py
@@ -457,6 +457,8 @@ ignored_schemes_other = r"""
 |gemini     # Gemini protocol
 |isbn       # ISBN (int. book numbers)
 |javascript # JavaScript
+|litecoin   # Litecoin payment
+|ltclightning # Litecoin Lightning invoice
 |ms\-windows\-store # Microsoft Store
 |slack      # Slack Technologies client
 |tg         # Telegram
diff --git a/scripts/update_iana_uri_schemes.py b/scripts/update_iana_uri_schemes.py
index c38adecb..aac2fded 100644
--- a/scripts/update_iana_uri_schemes.py
+++ b/scripts/update_iana_uri_schemes.py
@@ -16,6 +16,8 @@ iana_uri_schemes_other = {
     "gemini": "Gemini protocol",
     "isbn": "ISBN (int. book numbers)",
     "javascript": "JavaScript",
+    "litecoin": "Litecoin payment",
+    "ltclightning": "Litecoin Lightning invoice",
     "ms-windows-store": "Microsoft Store",
     "slack": "Slack Technologies client",
     "tg": "Telegram",