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-rw-r--r--tools/build/options/WITH_CLEAN3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/build/options/WITH_CLEAN b/tools/build/options/WITH_CLEAN
index d5962258bcc0..0bb05e33371b 100644
--- a/tools/build/options/WITH_CLEAN
+++ b/tools/build/options/WITH_CLEAN
@@ -1 +1,4 @@
Clean before building world and/or kernel.
+Note that recording a new epoch in
+.Pa .clean_build_epoch
+in the root of the source tree will also force a clean world build.