Add a note for bazel clean.

#codehealth PiperOrigin-RevId: 573636115
google · Oct 15, 2023 · 00f867b · 00f867b
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commit 00f867b
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diff --git 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.