diff --git a/libs/binder/include/binder/Parcel.h b/libs/binder/include/binder/Parcel.h
index 698de01..5209140 100644
--- a/libs/binder/include/binder/Parcel.h
+++ b/libs/binder/include/binder/Parcel.h
@@ -388,6 +388,11 @@
     LIBBINDER_EXPORTED status_t
     writeUniqueFileDescriptorVector(const std::vector<binder::unique_fd>& val);
 
+    // WARNING: deprecated and incompatible with AIDL. You should use Parcelable
+    // definitions outside of Parcel to represent shared memory, such as
+    // IMemory or with ParcelFileDescriptor. We should remove this, or move it to be
+    // external to Parcel, it's not a very encapsulated API.
+    //
     // Writes a blob to the parcel.
     // If the blob is small, then it is stored in-place, otherwise it is
     // transferred by way of an anonymous shared memory region.  Prefer sending
@@ -629,6 +634,11 @@
     LIBBINDER_EXPORTED status_t
     readUniqueFileDescriptorVector(std::vector<binder::unique_fd>* val) const;
 
+    // WARNING: deprecated and incompatible with AIDL. You should use Parcelable
+    // definitions outside of Parcel to represent shared memory, such as
+    // IMemory or with ParcelFileDescriptor. We should remove this, or move it to be
+    // external to Parcel, it's not a very encapsulated API.
+    //
     // Reads a blob from the parcel.
     // The caller should call release() on the blob after reading its contents.
     LIBBINDER_EXPORTED status_t readBlob(size_t len, ReadableBlob* outBlob) const;
diff --git a/libs/binder/include/binder/SafeInterface.h b/libs/binder/include/binder/SafeInterface.h
index 0b4f196..bcbd14f 100644
--- a/libs/binder/include/binder/SafeInterface.h
+++ b/libs/binder/include/binder/SafeInterface.h
@@ -34,6 +34,13 @@
 namespace android {
 namespace SafeInterface {
 
+/**
+ * WARNING: Prefer to use AIDL-generated interfaces. Using SafeInterface to generate interfaces
+ * does not support tracing, and many other AIDL features out of the box. The general direction
+ * we should go is to migrate safe interface users to AIDL and then remove this so that there
+ * is only one thing to learn/use/test/integrate, not this as well.
+ */
+
 // ParcelHandler is responsible for writing/reading various types to/from a Parcel in a generic way
 class LIBBINDER_EXPORTED ParcelHandler {
 public: