diff --git a/core/README.md b/core/README.md
index 42cb31cb..2b437ac4 100644
--- a/core/README.md
+++ b/core/README.md
@@ -28,15 +28,15 @@ simple/
└── timer.c
-- build.sh
+- build.sh
The script to build all binaries.
-- CMakeLists.txt
+- CMakeLists.txt
CMake file used to build the simple application.
-- README.md
+- README.md
The file you are reading currently.
-- src/ext-lib-export.c
+- src/ext-lib-export.c
This file is used to export native APIs. See README.md in WAMR root directory for detail.
-- src/iwam_main.c
+- src/iwam_main.c
This file should be implemented by platform integrator in which a host interface is provided to interact with WAMR app-manager. See `{WAMR_ROOT}/core/app-mgr/app-mgr-shared/app-manager-export.h` for the definition of the host interface.
```
/* Interfaces of host communication */
@@ -61,9 +61,9 @@ app_manager_startup(&interface);
The `host_init_func` is automatically called when app-manager startup. And `host_send_fun` will be called by app-manager to send data to host anytime.
>Note: Currently since app-manager will keep running and never exit, `host_destroy_fun` has no chance to get executed. So you can leave this API implementation empty.
-- src/main.c
+- src/main.c
The main file.
-- wasm-apps
+- wasm-apps
Source files of sample wasm applications.
Build all binaries