diff --git a/docs/howto/how-to-cross-build-runtime-for-android.md b/docs/howto/how-to-cross-build-runtime-for-android.md
index 13984a034d4..f2ed0036faa 100644
--- a/docs/howto/how-to-cross-build-runtime-for-android.md
+++ b/docs/howto/how-to-cross-build-runtime-for-android.md
@@ -1,2 +1,41 @@
 # How to Cross-build Runtime for Android
 
+**Note: To set up a basic build environment on your development PC, please read the [how-to-build-runtime.md](how-to-build-runtime.md) document first. The cross build covered in this document assumes that you have an environment in which the native build operates normally without problems.**
+
+Supported Architecture : AARCH64 only (ARM32 is not supported yet)
+
+## Prepare Android NDK
+
+Use `tools/cross/install_android_ndk.sh` script to prepare Android NDK. This is recommended way to build Android NDK.
+
+Or you can use `tools/cross/install_android_sdk.sh` script to prepare Android SDK including NDK. You can find NDK in `{android-sdk-dir}/ndk/{ndk-version}` directory.
+
+## Build
+
+### Host Environment Requirements
+
+CMake 3.6.0 or later is required for Android NDK r20 CMake support.
+So if you want to use Docker, please use `infra/docker/focal/Dockerfile` which is based on Ubuntu 20.04. It has CMake 3.16.3.
+
+```
+$ ./nnas build-docker-image -t nnfw/one-devtools:focal
+```
+
+
+### Build and install the runtime
+
+Some tools/libs are still not supported and those are not built by default - mostly due to dependency on HDF5 library.
+Please refer to `infra/nnfw/cmake/options/options_aarch64-android.cmake` for details.
+
+Different from cross build for linux,
+
+- `NDK_DIR` is required
+
+Here is an example of using Makefile.
+
+```bash
+TARGET_OS=android \
+CROSS_BUILD=1 \
+NDK_DIR=/path/android-sdk/ndk/{ndk-version}/ \
+make -f Makefile.template install
+```
diff --git a/docs/nnfw/howto/CrossBuildForAndroid.md b/docs/nnfw/howto/CrossBuildForAndroid.md
deleted file mode 100644
index 532eb57dea2..00000000000
--- a/docs/nnfw/howto/CrossBuildForAndroid.md
+++ /dev/null
@@ -1,41 +0,0 @@
-# Cross building for Android
-
-**Note: To set up a basic build environment on your development PC, please read the [howto.md](../howto.md) document first. The cross build covered in this document assumes that you have an environment in which the native build operates normally without problems.**
-
-Supported Architecture : AARCH64 only (ARM32 is not supported yet)
-
-## Prepare Android NDK
-
-Use `tools/cross/install_android_ndk.sh` script to prepare Android NDK. This is recommended way to build Android NDK.
-
-Or you can use `tools/cross/install_android_sdk.sh` script to prepare Android SDK including NDK. You can find NDK in `{android-sdk-dir}/ndk/{ndk-version}` directory.
-
-## Build
-
-### Host Environment Requirements
-
-CMake 3.6.0 or later is required for Android NDK r20 CMake support.
-So if you want to use Docker, please use `infra/docker/focal/Dockerfile` which is based on Ubuntu 20.04. It has CMake 3.16.3.
-
-```
-$ ./nnas build-docker-image -t nnfw/one-devtools:focal
-```
-
-
-### Build and install the runtime
-
-Some tools/libs are still not supported and those are not built by default - mostly due to dependency on HDF5 library.
-Please refer to `infra/nnfw/cmake/options/options_aarch64-android.cmake` for details.
-
-Different from cross build for linux,
-
-- `NDK_DIR` is required
-
-Here is an example of using Makefile.
-
-```bash
-TARGET_OS=android \
-CROSS_BUILD=1 \
-NDK_DIR=/path/android-sdk/ndk/{ndk-version}/ \
-make -f Makefile.template install
-```