diff --git a/src/main.cc b/src/main.cc
index 60efeae..c56a563 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -152,39 +152,46 @@ auto main(int argc, char *argv[]) noexcept -> int {
     const std::vector<std::string> arguments{argv + std::min(2, argc),
                                              argv + argc};
     return jsonschema_main(program, command, arguments);
+
   } catch (const sourcemeta::jsontoolkit::SchemaReferenceError &error) {
     std::cerr << "error: " << error.what() << "\n  " << error.id()
               << "\n    at schema location \"";
     sourcemeta::jsontoolkit::stringify(error.location(), std::cerr);
     std::cerr << "\"\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::SchemaResolutionError &error) {
     std::cerr << "error: " << error.what() << "\n  at " << error.id() << "\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::SchemaError &error) {
     std::cerr << "error: " << error.what() << "\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::SchemaVocabularyError &error) {
     std::cerr << "error: " << error.what() << "\n  " << error.uri()
               << "\n\nTo request support for it, please open an issue "
-                 "at\nhttps://github.com/sourcemeta/jsonschema\n";
+              << "at\nhttps://github.com/sourcemeta/jsonschema\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::URIParseError &error) {
     std::cerr << "error: " << error.what() << " at column " << error.column()
               << "\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::FileParseError &error) {
     std::cerr << "error: " << error.what() << " at line " << error.line()
               << " and column " << error.column() << "\n  "
               << std::filesystem::weakly_canonical(error.path()).string()
               << "\n";
     return EXIT_FAILURE;
+
   } catch (const sourcemeta::jsontoolkit::ParseError &error) {
     std::cerr << "error: " << error.what() << " at line " << error.line()
               << " and column " << error.column() << "\n";
     return EXIT_FAILURE;
+
   } catch (const std::filesystem::filesystem_error &error) {
-    // See https://en.cppreference.com/w/cpp/error/errc
     if (error.code() == std::errc::no_such_file_or_directory) {
       std::cerr << "error: " << error.code().message() << "\n  "
                 << std::filesystem::weakly_canonical(error.path1()).string()
@@ -197,11 +204,12 @@ auto main(int argc, char *argv[]) noexcept -> int {
     } else {
       std::cerr << "error: " << error.what() << "\n";
     }
-
     return EXIT_FAILURE;
+
   } catch (const std::runtime_error &error) {
     std::cerr << "error: " << error.what() << "\n";
     return EXIT_FAILURE;
+
   } catch (const std::exception &error) {
     std::cerr << "unexpected error: " << error.what()
               << "\nPlease report it at "