diff --git a/extras/tests/JsonDeserializer/errors.cpp b/extras/tests/JsonDeserializer/errors.cpp
index 35d3ca39..3fabe4d4 100644
--- a/extras/tests/JsonDeserializer/errors.cpp
+++ b/extras/tests/JsonDeserializer/errors.cpp
@@ -121,7 +121,7 @@ TEST_CASE("deserializeJson() returns NoMemory if string length overflows") {
   }
 }
 
-TEST_CASE("deserializeJson() returns NoMemory if extension allocation fails") {
+TEST_CASE("deserializeJson() returns NoMemory if 8-bit slot allocation fails") {
   JsonDocument doc(FailingAllocator::instance());
 
   SECTION("uint32_t should pass") {
diff --git a/extras/tests/JsonVariant/set.cpp b/extras/tests/JsonVariant/set.cpp
index aee1086a..07d91f6c 100644
--- a/extras/tests/JsonVariant/set.cpp
+++ b/extras/tests/JsonVariant/set.cpp
@@ -393,7 +393,7 @@ TEST_CASE("JsonVariant::set() releases the previous value") {
   }
 }
 
-TEST_CASE("JsonVariant::set() reuses extension slot") {
+TEST_CASE("JsonVariant::set() reuses 8-bit slot") {
   SpyingAllocator spy;
   JsonDocument doc(&spy);
   JsonVariant variant = doc.to<JsonVariant>();