diff --git a/doc/build_wasm_app.md b/doc/build_wasm_app.md
index 4034b1f5e1..29cc911011 100644
--- a/doc/build_wasm_app.md
+++ b/doc/build_wasm_app.md
@@ -160,6 +160,11 @@ Firstly if libc-builtin (-nostdlib) mode meets the requirements, e.g. there are
 
 Most of the above methods are also available for libc-wasi mode, besides them, we can export malloc and free functions with `-Wl,--export=malloc -Wl,--export=free` option, so WAMR runtime will disable its app heap and call the malloc/free function exported to allocate/free the memory from/to the heap space managed by libc.
 
+Note: wasm-ld from LLVM 13 and later automatically inserts dtor calls
+for exported funtions. It breaks the malloc/free export mentioned above.
+A workaround: Add `-Wl,--export=__wasm_call_ctors`, which happens to
+prevent the automatic insertions for the current implementation.
+
 ## 3. Build wasm app with pthread support
 
 Please ref to [pthread library](./pthread_library.md) for more details.