diff --git a/assets/exam-simulator.js b/assets/exam-simulator.js
index 2efb9aa..977c06a 100644
--- a/assets/exam-simulator.js
+++ b/assets/exam-simulator.js
@@ -38,7 +38,7 @@
     if (!value) return [];
     var seen = new Set();
     return value.toUpperCase().split(/[\s+,]+/).filter(function (questionId) {
-      if (!/^[A-Z]{2}\d{3}$/.test(questionId) || seen.has(questionId)) return false;
+      if (!/^[A-Z]{2,3}\d{3}$/.test(questionId) || seen.has(questionId)) return false;
       seen.add(questionId);
       return true;
     });
diff --git a/assets/homework.js b/assets/homework.js
index b500b8b..c0279f2 100644
--- a/assets/homework.js
+++ b/assets/homework.js
@@ -2,6 +2,7 @@
   "use strict";
 
   var COURSE_CHOICES = [
+    { edition: "SWL", label: "SWL-Kurs", detail: "Kurzwellenhören", color: "#FFFFFF" },
     { edition: "N", label: "N-Kurs", detail: "N", color: "#47ABE8" },
     { edition: "NE", label: "E-Kurs", detail: "N + E", color: "#FE756C" },
     { edition: "NEA", label: "A-Kurs", detail: "N + E + A", color: "#3BB583" },
diff --git a/assets/question-catalog.js b/assets/question-catalog.js
index 4b682f5..357803f 100644
--- a/assets/question-catalog.js
+++ b/assets/question-catalog.js
@@ -12,9 +12,9 @@
 
     function walk(section, sectionIndex, category) {
       (section.questions || []).forEach(function (question) {
-        var part = sectionIndex === 0
-          ? partForClass[String(question.class)]
-          : partForSection[sectionIndex];
+        var part = String(question.class) === "SWL"
+          ? "SWL"
+          : (sectionIndex === 0 ? partForClass[String(question.class)] : partForSection[sectionIndex]);
         if (!part) return;
 
         var questionMetadata = metadata[question.number] || {};
diff --git a/build.py b/build.py
index a8f4c68..d23027e 100644
--- a/build.py
+++ b/build.py
@@ -6,6 +6,7 @@ conf = config.Config()
 # Build Everything:
 bd = build.Build(conf)
 bd.build_website()
+bd.build_edition("SWL")
 bd.build_edition("N")
 bd.build_edition("E")
 bd.build_edition("A")
diff --git a/main.py b/main.py
index 51bf833..78cd7c9 100644
--- a/main.py
+++ b/main.py
@@ -12,6 +12,7 @@ app = typer.Typer()
 @app.command()
 def main(
     edition: Annotated[list[Edition], typer.Option(help="Edition to build, can be specified multiple times.")] = [  # noqa: B006 -- default value is required for typer
+        Edition.swl,
         Edition.n,
         Edition.e,
         Edition.a,
diff --git a/src/build.py b/src/build.py
index 19b974b..c9d9521 100644
--- a/src/build.py
+++ b/src/build.py
@@ -215,8 +215,11 @@ class Build:
     def __build_homework_tool(self):
         toc_target = self.config.p_build_assets / "toc"
         toc_target.mkdir(parents=True, exist_ok=True)
-        for edition in ("N", "NE", "NEA", "E", "EA", "A"):
-            shutil.copyfile(self.config.p_data_toc / f"{edition}.json", toc_target / f"{edition}.json")
+        for edition in ("SWL", "N", "NE", "NEA", "E", "EA", "A"):
+            source = self.config.p_data_toc / f"{edition}.json"
+            if not source.exists():
+                source = self.config.p_data_toc / f"{edition.lower()}.json"
+            shutil.copyfile(source, toc_target / f"{edition}.json")
 
         homework_template = self.env.get_template("html/homework.html")
         page = self.__build_page(
@@ -439,9 +442,12 @@ class Build:
         self.config.p_build.mkdir(exist_ok=True)
 
         edition = edition.upper()
+        toc_file = self.config.p_data_toc / f"{edition}.json"
+        if not toc_file.exists():
+            toc_file = self.config.p_data_toc / f"{edition.lower()}.json"
 
         with (
-            (self.config.p_data_toc / f"{edition}.json").open(encoding="utf-8") as file,
+            toc_file.open(encoding="utf-8") as file,
             Progress(
                 TaskProgressColumn(),
                 BarColumn(),
@@ -480,9 +486,11 @@ class Build:
                     with (self.config.p_data_sections / f"{ident}.md").open(encoding="utf-8") as sfile:
                         section_content = sfile.read()
                         section["content"] = section_content
-                    with (self.config.p_data_slides / f"{ident}.md").open(encoding="utf-8") as sfile:
-                        section_content = sfile.read()
-                        section["slide"] = section_content
+                    slide_file = self.config.p_data_slides / f"{ident}.md"
+                    if slide_file.exists():
+                        with slide_file.open(encoding="utf-8") as sfile:
+                            section_content = sfile.read()
+                            section["slide"] = section_content
 
                     if section["content"] is not None:
                         self.__collect_question_occurrences(
diff --git a/src/edition.py b/src/edition.py
index 2a250c5..fa079f2 100644
--- a/src/edition.py
+++ b/src/edition.py
@@ -2,6 +2,7 @@ from enum import StrEnum
 
 
 class Edition(StrEnum):
+    swl = "SWL"
     n = "N"
     e = "E"
     a = "A"
diff --git a/test/test_swl_question_catalog.py b/test/test_swl_question_catalog.py
index ef1cea6..828e0e7 100644
--- a/test/test_swl_question_catalog.py
+++ b/test/test_swl_question_catalog.py
@@ -71,3 +71,34 @@ def test_missing_optional_swl_catalog_is_allowed(tmp_path):
 
     assert set(build.questions) == {"NA101"}
     assert len(build.fragenkatalog["sections"]) == 1
+
+
+def test_lowercase_swl_toc_is_supported(tmp_path):
+    prepare_content(tmp_path, include_swl=True)
+    toc_path = tmp_path / "toc"
+    section_path = tmp_path / "contents" / "sections"
+    toc_path.mkdir()
+    section_path.mkdir()
+    (section_path / "swl_intro.md").write_text("Einführung", encoding="utf-8")
+    (toc_path / "swl.json").write_text(
+        json.dumps(
+            {
+                "title": "SWL-Kurs",
+                "edition": "SWL",
+                "chapters": [
+                    {
+                        "title": "Einstieg",
+                        "ident": "swl_einstieg",
+                        "sections": [{"title": "Einführung", "ident": "swl_intro"}],
+                    }
+                ],
+            }
+        ),
+        encoding="utf-8",
+    )
+
+    build = Build(Config(content_path=tmp_path, build_path=tmp_path / "build"))
+
+    build.build_edition("SWL")
+    assert (tmp_path / "build" / "SWL_course_index.html").exists()
+    assert (tmp_path / "build" / "SWL_swl_intro.html").exists()