diff --git a/.gitignore b/.gitignore
index 15d073a..8c7b8f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 # CMake
-build/
+/build/
 CMakeCache.txt
 CMakeFiles
 CMakeScripts
diff --git a/tests/fuzzer/fuzz_gltf_customjson.cc b/tests/fuzzer/fuzz_gltf_customjson.cc
index cdab09e..8f8da75 100644
--- a/tests/fuzzer/fuzz_gltf_customjson.cc
+++ b/tests/fuzzer/fuzz_gltf_customjson.cc
@@ -61,7 +61,10 @@ static void fuzz_binary(const uint8_t *data, size_t size) {
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   if (size == 0) return 0;
 
-  /* Use the first byte to select the parse path, pass the rest as input. */
+  /* Use the lowest bit of the first byte to select the parse path.
+   * The remaining bits are left for the fuzzer engine to explore;
+   * additional paths (e.g. LoadASCIIFromFile, check_sections flags)
+   * can be added here in the future using more selector bits. */
   uint8_t selector = data[0];
   const uint8_t *payload = data + 1;
   size_t payload_size = size - 1;
diff --git a/tests/tester_intensive_customjson.cc b/tests/tester_intensive_customjson.cc
index d681b7e..ad41fbf 100644
--- a/tests/tester_intensive_customjson.cc
+++ b/tests/tester_intensive_customjson.cc
@@ -401,11 +401,18 @@ TEST_CASE("cj-malformed-incomplete-null", "[customjson][malformed]") {
 }
 
 TEST_CASE("cj-malformed-extra-data", "[customjson][malformed]") {
-  // Valid JSON followed by extra data
+  // Valid JSON followed by extra non-whitespace data
   auto doc = JsonConstruct("42 extra");
   REQUIRE(doc.is_null());
 }
 
+TEST_CASE("cj-trailing-whitespace-ok", "[customjson][parse]") {
+  // Valid JSON followed by whitespace only should be accepted
+  auto doc = JsonConstruct("42   \t\n ");
+  REQUIRE(doc.is_number());
+  REQUIRE(doc.get<int>() == 42);
+}
+
 TEST_CASE("cj-malformed-just-brace", "[customjson][malformed]") {
   auto doc = JsonConstruct("{");
   REQUIRE(doc.is_null());