diff --git a/.github/workflows/compilation_on_nuttx.yml b/.github/workflows/compilation_on_nuttx.yml
index 98cbb24ff..5ff2d181c 100644
--- a/.github/workflows/compilation_on_nuttx.yml
+++ b/.github/workflows/compilation_on_nuttx.yml
@@ -61,8 +61,6 @@ jobs:
           "boards/arm/rp2040/raspberrypi-pico/configs/nsh",
           # cortex-m7
           "boards/arm/stm32h7/nucleo-h743zi/configs/nsh",
-          # riscv32imc
-          "boards/risc-v/espressif/esp32c3-generic/configs/nsh",
           # riscv32gc
           "boards/risc-v/qemu-rv/rv-virt/configs/nsh",
           # riscv64gc
@@ -114,3 +112,26 @@ jobs:
           cd nuttx
           tools/configure.sh ${{ matrix.nuttx_board_config }}
           make -j$(nproc) EXTRAFLAGS=-Werror
+
+      - name: Checkout Bloaty
+        uses: actions/checkout@v3
+        with:
+          repository: google/bloaty
+          submodules: recursive
+          path: bloaty
+
+      - name: Build Bloaty
+        run: |
+          cmake -Bbuild -GNinja bloaty
+          cmake --build build
+
+      - name: Size Report
+        run: |
+          echo "Build target: ${{ matrix.nuttx_board_config }}"
+          echo "WAMR build config: ${{ matrix.wamr_config_option }}"
+          echo "WAMR size:"
+          build/bloaty -d compileunits --source-filter wamr nuttx/nuttx
+          echo "libc-builtin size (if enabled):"
+          build/bloaty -d compileunits --source-filter libc-builtin nuttx/nuttx
+          echo "libc-wasi size (if enabled):"
+          build/bloaty -d compileunits --source-filter libc-wasi nuttx/nuttx
diff --git a/README.md b/README.md
index d09e826ab..d89d0cd17 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,12 @@ WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm)
 
 ### Key features
 - Full compliant to the W3C Wasm MVP
-- Small runtime binary size (~85K for interpreter and ~50K for AOT) and low memory usage
+- Small runtime binary size (core vmlib on cortex-m4f with tail-call/bulk memroy/shared memroy support, text size from bloaty)
+  * ~58.9K for fast interpreter
+  * ~56.3K for classic interpreter
+  * ~29.4K for aot runtime
+  * ~21.4K for libc-wasi library
+  * ~3.7K for libc-builtin library
 - Near to native speed by AOT and JIT
 - Self-implemented AOT module loader to enable AOT working on Linux, Windows, MacOS, Android, SGX and MCU systems
 - Choices of Wasm application libc support: the built-in libc subset for the embedded environment or [WASI](https://github.com/WebAssembly/WASI) for the standard libc