diff --git a/extensions/bitstring-2.1.0.zip b/extensions/bitstring-2.1.0.zip
deleted file mode 100644
index b7692d0..0000000
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diff --git a/extensions/bitstring-2.3.0.zip b/extensions/bitstring-2.3.0.zip
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diff --git a/extensions/lt-1.0.0.zip b/extensions/lt-1.0.0.zip
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diff --git a/libraries.conf b/libraries.conf
index 7d304f0..76713ef 100644
--- a/libraries.conf
+++ b/libraries.conf
@@ -37,8 +37,8 @@ Unlike NetLogo’s lists and strings, arrays are “mutable”. That means that
     shortDescription: "Provides bitstrings as datatypes and commands to operate on them"
     longDescription: """A bitstring extension for NetLogo. Bitstrings are strings of binary digits. This extension provides you with an implementation of bitstrings and a number of commands and reporters to operate on them."""
     version: "2.1.0"
-    homepage: "https://github.com/garypolhill/netlogo-bitstring/blob/nl6/README.md"
-    downloadURL: "https://raw.githubusercontent.com/NetLogo/NetLogo-Libraries/6.1/extensions/bitstring-2.1.0.zip"
+    homepage: "https://github.com/garypolhill/netlogo-bitstring/"
+    downloadURL: "https://raw.githubusercontent.com/NetLogo/NetLogo-Libraries/6.1/extensions/bitstring-2.3.0.zip"
   }
   {
     name: "Case based reasoning"
@@ -324,6 +324,17 @@ The lt extension provides a mutable list datatype, with commands that change the
       homepage: "https://github.com/DougSalt/lkt.git"
       downloadURL: "https://raw.githubusercontent.com/NetLogo/NetLogo-Libraries/6.1/extensions/lkt-1.0.0.zip"
   }
+  {
+    name: "list"
+    codename: "lt"
+    shortDescription: "A mutable list datatype for NetLogo"
+    longDescription: """NetLogo's built-in list datatype is immutable -- once a list is created, you cannot change it. Instead NetLogo commands such as `fput` create a new list from the old list and whatever change the command stipulates.
+
+The lt extension provides a mutable list datatype, with commands that change the original list rather than creating a new one. In code where you are working with very long lists, you may find this more efficient."""
+    version: "1.0.0"
+    homepage: "https://github.com/garypolhill/netlogo-list"
+    downloadURL: "https://github.com/garypolhill/netlogo-list/blob/main/zip/lt-1.0.0.zip"
+  }
   {
     name: "LPSolver"
     codeName: "lpsolver"