From cdbb778dc68fee43474f6bbb0db23afb0d74c098 Mon Sep 17 00:00:00 2001
From: Hiroyuki Komatsu <komatsu@google.com>
Date: Sun, 15 Oct 2023 17:31:10 +0000
Subject: [PATCH] Add a note for `bazel clean`.

#codehealth

PiperOrigin-RevId: 573636115
---
 docs/build_mozc_in_docker.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/docs/build_mozc_in_docker.md b/docs/build_mozc_in_docker.md
index b12e612cea..bc9b229aff 100644
--- a/docs/build_mozc_in_docker.md
+++ b/docs/build_mozc_in_docker.md
@@ -172,6 +172,21 @@ This command reverts the above change.
 git update-index --no-assume-unchanged src/config.bzl
 ```
 
+### Clean build cache
+
+You may have some build errors when you update build environment or configurations.
+In that case, cleaing the build cache possibly addresses the problem.
+
+```
+bazel clean
+```
+
+To clean the cache deeply, add the `--expunge` option.
+
+```
+bazel clean --expunge
+```
+
 ## Build Mozc library for Android:
 
 Client code for Android apk is deprecated.