diff --git a/docs/user_doc.md b/docs/user_doc.md
index 0eea9f7..a156f13 100644
--- a/docs/user_doc.md
+++ b/docs/user_doc.md
@@ -14,4 +14,6 @@ If a unit test failed, this is shown below the build status. You can also expand
 After every build the build server will comment on your latest patch, so that you can also see the results for previous changes. The comment also contains a link to the log files:
 ![bot comment](images/bot_comment.png)
 
-You can also trigger a build manually by using the "Run Plan Manually" link on the [Harbormaster page](https://reviews.llvm.org/harbormaster/plan/3/) and entering a revision ID in the pop-up window.
\ No newline at end of file
+The build logs are stored for 90 days and automatically deleted after that.
+
+You can also trigger a build manually by using the "Run Plan Manually" link on the [Harbormaster page](https://reviews.llvm.org/harbormaster/plan/3/) and entering a revision ID in the pop-up window.