diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 41b17f8..64fabad 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -17,7 +17,7 @@ jobs:
         run: |
           bazel run //tools:buildifier.check
 
-  check-tidy:
+  check-tidy-matrix:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -25,28 +25,20 @@ jobs:
         include:
           - bazel: latest
             compiler: clang-18
-            example: misc-unused-alias-decls
           - bazel: latest
             compiler: clang-17
-            example: misc-unused-alias-decls
           - bazel: latest
             compiler: clang-16
-            example: misc-unused-alias-decls
           - bazel: latest
             compiler: clang-15
-            example: misc-unused-alias-decls
           - bazel: latest
             compiler: clang-14
-            example: misc-unused-alias-decls
           - bazel: 7.x
             compiler: clang-18
-            example: misc-unused-alias-decls
           - bazel: 6.x
             compiler: clang-18
-            example: misc-unused-alias-decls
           - bazel: 5.x
             compiler: clang-18
-            example: misc-unused-alias-decls
 
     steps:
       - name: install ${{ matrix.compiler }}
@@ -74,7 +66,7 @@ jobs:
         run: |
           set -x
 
-          cd example/${{ matrix.example }}
+          cd example
 
           if [[ "${{ matrix.bazel }}" < 6 ]]; then
             sed -i '/enable_bzlmod/d' .bazelrc
@@ -85,14 +77,56 @@ jobs:
             --config=clang-tidy \
             --color=yes \
             //... | tee log || true
-          cat log
-          grep "error: .*${{ matrix.example }}" log
+
+          grep "error: .*misc-unused-alias-decls" log
+
+  check-tidy-extra-options:
+    runs-on: ubuntu-latest
+    steps:
+      - name: install clang-tidy
+        shell: bash
+        run: |
+          set -x
+
+          version=18
+
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh $version
+          sudo apt-get install -y clang-tidy-$version libc++-$version-dev
+
+          sudo ln -sf $(which clang-tidy-$version) /usr/bin/clang-tidy
+          clang-tidy-$version --version
+
+      - uses: actions/checkout@v4
+
+      - name: run clang-tidy
+        shell: bash
+        env:
+          CC: clang-18
+        run: |
+          set -x
+
+          cd example
+
+          bazel build \
+            --announce_rc \
+            --config=clang-tidy \
+            --color=yes \
+            --@rules_clang_tidy//:extra-options=--enable-check-profile \
+            --@rules_clang_tidy//:extra-options=--checks='fuchsia-*' \
+            //... | tee log || true
+
+          grep "clang-tidy checks profiling" log
+          grep "error: .*misc-unused-alias-decls" log
+          grep "error: .*fuchsia-trailing-return" log
 
   all:
     runs-on: ubuntu-latest
     if: ${{ github.base_ref == 'main' }}
     needs:
       - buildifier
-      - check-tidy
+      - check-tidy-matrix
+      - check-tidy-extra-options
     steps:
     - run: true
diff --git a/BUILD.bazel b/BUILD.bazel
index ab0cec2..230a797 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -1,4 +1,4 @@
-load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
+load("//private:extra_options_flag.bzl", "extra_options_flag")
 load("//private:path_binary_wrapper.bzl", "path_binary_wrapper")
 
 package(default_visibility = ["//visibility:public"])
@@ -36,9 +36,9 @@ label_flag(
 # Extra options appended after `tidy_options`. This allows extra options to be
 # specified on the command line (e.g. changing the checks to use with
 # `clang-tidy`).
-string_flag(
+extra_options_flag(
     name = "extra-options",
-    build_setting_default = "",
+    build_setting_default = [""],
 )
 
 # Manually applies fixes from .yaml files contained in a specified directory.
diff --git a/README.md b/README.md
index 4ea5ecf..8b1110c 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,8 @@ build:clang-tidy-export-fixes --remote_download_outputs=toplevel
 bazel build //... --config=clang-tidy-export-fixes
 ```
 
-If only a subset of checks needs to be run, those can be specified with `extra-options`.
+If only a subset of checks needs to be run, those can be specified with
+`extra-options`. This flag can be specified multiples times.
 
 ```sh
 bazel build //... --config=clang-tidy-export-fixes \
@@ -160,4 +161,4 @@ set, `clang-apply-replacements` must be in `PATH`. Similarly to
 ## Requirements
 
 - Bazel 5.x
-- ClangTidy ??
+- ClangTidy ?? (at least 14?)
diff --git a/example/misc-unused-alias-decls/.bazelrc b/example/.bazelrc
similarity index 100%
rename from example/misc-unused-alias-decls/.bazelrc
rename to example/.bazelrc
diff --git a/example/BUILD.bazel b/example/BUILD.bazel
new file mode 100644
index 0000000..0eae3fe
--- /dev/null
+++ b/example/BUILD.bazel
@@ -0,0 +1,4 @@
+cc_binary(
+    name = "misc-unused-alias-decls",
+    srcs = ["misc-unused-alias-decls.cpp"],
+)
diff --git a/example/misc-unused-alias-decls/WORKSPACE.bazel b/example/WORKSPACE.bazel
similarity index 71%
rename from example/misc-unused-alias-decls/WORKSPACE.bazel
rename to example/WORKSPACE.bazel
index 0592cd1..c379d96 100644
--- a/example/misc-unused-alias-decls/WORKSPACE.bazel
+++ b/example/WORKSPACE.bazel
@@ -1,4 +1,4 @@
 local_repository(
     name = "rules_clang_tidy",
-    path = "../..",
+    path = "..",
 )
diff --git a/example/misc-unused-alias-decls/main.cpp b/example/misc-unused-alias-decls.cpp
similarity index 100%
rename from example/misc-unused-alias-decls/main.cpp
rename to example/misc-unused-alias-decls.cpp
diff --git a/example/misc-unused-alias-decls/BUILD.bazel b/example/misc-unused-alias-decls/BUILD.bazel
deleted file mode 100644
index 2938ae1..0000000
--- a/example/misc-unused-alias-decls/BUILD.bazel
+++ /dev/null
@@ -1,4 +0,0 @@
-cc_binary(
-    name = "main",
-    srcs = ["main.cpp"],
-)
diff --git a/make_clang_tidy_aspect.bzl b/make_clang_tidy_aspect.bzl
index 0ecfaf2..03b546a 100644
--- a/make_clang_tidy_aspect.bzl
+++ b/make_clang_tidy_aspect.bzl
@@ -127,7 +127,7 @@ sed --in-place --expression "s+$(pwd)+%workspace%+g" {outfile}
                 " ".join(kwargs["tidy_options"]),
             ),
             extra_options = sub_outfile(
-                ctx.attr._extra_options[BuildSettingInfo].value,
+                " ".join(ctx.attr._extra_options[BuildSettingInfo].value),
             ),
             infile = source_file.path,
             outfile = out.path,
diff --git a/private/extra_options_flag.bzl b/private/extra_options_flag.bzl
new file mode 100644
index 0000000..00bb564
--- /dev/null
+++ b/private/extra_options_flag.bzl
@@ -0,0 +1,18 @@
+"""
+Defines a repeatable options flag.
+"""
+
+load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo")
+
+def _impl(ctx):
+    return [
+        BuildSettingInfo(value = ctx.build_setting_value),
+    ]
+
+extra_options_flag = rule(
+    implementation = _impl,
+    build_setting = config.string_list(
+        flag = True,
+        repeatable = True,
+    ),
+)