diff --git a/.github/releases/v0.4.1.md b/.github/releases/v0.4.1.md
new file mode 100644
index 0000000..113489b
--- /dev/null
+++ b/.github/releases/v0.4.1.md
@@ -0,0 +1,22 @@
+## `things-cli` v0.4.1 — fix Homebrew completion install
+
+Patch release. v0.4.0 added shell completions, but the Homebrew cask passed the
+shell name as `--shell=bash` (Homebrew's `:arg` format) while `things
+completions` takes the shell as a positional argument. The mismatch made
+`brew install` print "Failed to generate … completions" warnings and write no
+completion files.
+
+### Fix
+
+- The cask now calls `things completions bash|zsh|fish` with the shell as a bare
+  positional argument (Homebrew's default when `shell_parameter_format` is
+  omitted), matching the CLI. `brew install` / `brew upgrade` now generates the
+  bash, zsh, and fish completion files as intended.
+
+If you installed v0.4.0 from Homebrew, run `brew update && brew reinstall
+ryanlewis/tap/things` to pick up working completions.
+
+### Requirements
+
+macOS with Things3 installed. Binaries for Apple Silicon (`darwin_arm64`) and
+Intel (`darwin_amd64`).
diff --git a/.goreleaser.yaml b/.goreleaser.yaml
index 956888e..318552b 100644
--- a/.goreleaser.yaml
+++ b/.goreleaser.yaml
@@ -56,12 +56,13 @@ homebrew_casks:
     binaries:
       - things
     # Run `things completions <shell>` at cask install time to drop bash/zsh/fish
-    # completion scripts into the Homebrew prefix. `<shell>` is a positional arg
-    # (shell_parameter_format: arg) — matches the CLI added in #88 PR 1.
+    # completion scripts into the Homebrew prefix. The shell name is passed as a
+    # bare positional arg (`things completions bash`) — that's Homebrew's default
+    # when shell_parameter_format is omitted. Do NOT set it to `arg`: Homebrew's
+    # :arg emits `--shell=bash`, which our positional CLI rejects.
     generate_completions_from_executable:
       args: [completions]
       base_name: things
-      shell_parameter_format: arg
       shells: [bash, zsh, fish]
     repository:
       owner: ryanlewis