diff --git a/docs/manual/release-notes/rl-0.9.md b/docs/manual/release-notes/rl-0.9.md
index e31a07e8..662f7aeb 100644
--- a/docs/manual/release-notes/rl-0.9.md
+++ b/docs/manual/release-notes/rl-0.9.md
@@ -25,6 +25,12 @@
   - The `setupOpts.mappings` options were also removed. Use the built-in Neovim
     settings (nvf's {option}`vim.keymaps`)
 
+[Snoweuph](https://github.com/snoweuph)
+
+- Fix `vim.assistant.codecompanion-nvim.setupOpts.display.diff.provider` to only
+  allow valid options. `default` is no longer valid. `inline` and `split` are
+  two new valid options.
+
 ## Changelog {#sec-release-0-9-changelog}
 
 [taylrfnt](https://github.com/taylrfnt)
diff --git a/modules/plugins/assistant/codecompanion/codecompanion-nvim.nix b/modules/plugins/assistant/codecompanion/codecompanion-nvim.nix
index 8e5ed4cc..27603ad7 100644
--- a/modules/plugins/assistant/codecompanion/codecompanion-nvim.nix
+++ b/modules/plugins/assistant/codecompanion/codecompanion-nvim.nix
@@ -59,8 +59,8 @@ in {
             };
 
             provider = mkOption {
-              type = enum ["default" "mini_diff"];
-              default = "default";
+              type = enum ["inline" "split" "mini_diff"];
+              default = "inline";
               description = "The preferred kind of provider.";
             };
           };