diff --git a/base/include/hidl/HidlSupport.h b/base/include/hidl/HidlSupport.h
index c8d8db9..ab16709 100644
--- a/base/include/hidl/HidlSupport.h
+++ b/base/include/hidl/HidlSupport.h
@@ -290,6 +290,7 @@
         static_assert(hidl_vec<T>::kOffsetOfBuffer == 0, "wrong offset");
     }
 
+    // Note, does not initialize primitive types.
     hidl_vec(size_t size) : hidl_vec() { resize(size); }
 
     hidl_vec(const hidl_vec<T> &other) : hidl_vec() {
@@ -448,6 +449,7 @@
         return mBuffer[index];
     }
 
+    // Does not initialize primitive types if new size > old size.
     void resize(size_t size) {
         if (size > UINT32_MAX) {
             details::logAlwaysFatal("hidl_vec can't hold more than 2^32 elements.");
diff --git a/test_main.cpp b/test_main.cpp
index 89040c3..2811612 100644
--- a/test_main.cpp
+++ b/test_main.cpp
@@ -177,13 +177,11 @@
 TEST_F(LibHidlTest, VecInitTest) {
     using android::hardware::hidl_vec;
     using std::vector;
-    int32_t empty[3] = {0};
     int32_t array[] = {5, 6, 7};
     vector<int32_t> v(array, array + 3);
 
     hidl_vec<int32_t> hv0(3);  // size
-    EXPECT_EQ(hv0.size(), 3ul);
-    EXPECT_ARRAYEQ(hv0, empty, 3);
+    EXPECT_EQ(hv0.size(), 3ul);  // cannot say anything about its contents
 
     hidl_vec<int32_t> hv1 = v; // copy =
     EXPECT_ARRAYEQ(hv1, array, 3);