diff --git a/Libraries/LibWeb/HTML/HTMLMediaElement.cpp b/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
index 45523e1e5ba..94cc0b75590 100644
--- a/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
@@ -1259,8 +1259,8 @@ WebIDL::ExceptionOr<void> HTMLMediaElement::process_media_data(Function<void(Str
         if (enable == TriState::True)
             audio_track->set_enabled(true);
 
-        // AD-HOC(ish): According to https://dev.w3.org/html5/html-sourcing-inband-tracks/, kind should be set according to format, and the following criteria within
-        //              the specified formats.
+        // NB: According to https://dev.w3.org/html5/html-sourcing-inband-tracks/, kind should be set according to format, and the following criteria within
+        //     the specified formats.
         // WebM:
         //     - "main": the FlagDefault element is set on the track
         //     - "translation": not first audio (video) track
@@ -1318,7 +1318,7 @@ WebIDL::ExceptionOr<void> HTMLMediaElement::process_media_data(Function<void(Str
         if (enable == TriState::True)
             video_track->set_selected(true);
 
-        // AD-HOC(ish): See the comment regarding AudioTrack.kind above with regard to https://dev.w3.org/html5/html-sourcing-inband-tracks/.
+        // NB: See the comment regarding AudioTrack.kind above with regard to https://dev.w3.org/html5/html-sourcing-inband-tracks/.
         video_track->set_kind(enable == TriState::True ? "main"_utf16 : "translation"_utf16);
 
         // 7. Fire an event named addtrack at this VideoTrackList object, using TrackEvent, with the track attribute initialized to the new VideoTrack object.
diff --git a/Meta/check-style.py b/Meta/check-style.py
index f6bb76acd66..c35d85b49e1 100755
--- a/Meta/check-style.py
+++ b/Meta/check-style.py
@@ -57,6 +57,9 @@ LOCAL_INCLUDE_SUFFIX_EXCLUDES = [
 # We check for and disallow any comments linking to the single-page HTML spec because it takes a long time to load.
 SINGLE_PAGE_HTML_SPEC_LINK = re.compile("//.*https://html\\.spec\\.whatwg\\.org/#")
 
+# We similarily check and disallow AD-HOCs and FIXMEs that aren't followed by a colon.
+INVALID_AD_HOC_OR_FIXME = re.compile(r'^(?:[\s\d./\-(*]+(?:AD-HOC|FIXME)[^:]|.*"FIXME[^:"]).*$', re.MULTILINE)
+
 
 def should_check_file(filename):
     if not filename.endswith(".cpp") and not filename.endswith(".h"):
@@ -97,6 +100,7 @@ def run():
     errors_include_missing_local = []
     errors_include_bad_complex = []
     errors_single_page_html_spec = []
+    errors_invalid_ad_hoc_or_fixme = {}
 
     for filename in find_files_here_or_argv():
         with open(filename, mode="r", encoding="utf-8") as f:
@@ -146,6 +150,9 @@ def run():
                         errors_include_missing_local.append(filename)
         if SINGLE_PAGE_HTML_SPEC_LINK.search(file_content):
             errors_single_page_html_spec.append(filename)
+        invalid_ad_hocs_or_fixmes = INVALID_AD_HOC_OR_FIXME.findall(file_content)
+        if invalid_ad_hocs_or_fixmes:
+            errors_invalid_ad_hoc_or_fixme[filename] = invalid_ad_hocs_or_fixmes
 
     have_errors = False
     if errors_license:
@@ -184,6 +191,10 @@ def run():
     if errors_single_page_html_spec:
         print("Files with links to the single-page HTML spec:", " ".join(errors_single_page_html_spec))
         have_errors = True
+    if errors_invalid_ad_hoc_or_fixme:
+        for file in errors_invalid_ad_hoc_or_fixme:
+            print(f"{file} contains invalid AD-HOC or FIXME usages:", "".join(errors_invalid_ad_hoc_or_fixme[file]))
+        have_errors = True
 
     if have_errors:
         sys.exit(1)