diff --git a/include/android/surface_control.h b/include/android/surface_control.h
index eb9c528..91726cd 100644
--- a/include/android/surface_control.h
+++ b/include/android/surface_control.h
@@ -286,6 +286,9 @@
  * The frameworks takes ownership of the \a acquire_fence_fd passed and is responsible
  * for closing it.
  *
+ * Note that the buffer must be allocated with AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE
+ * as the surface control might be composited using the GPU.
+ *
  * Available since API level 29.
  */
 void ASurfaceTransaction_setBuffer(ASurfaceTransaction* transaction,