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-rw-r--r--cmd/geth/chaincmd.go3
1 files changed, 2 insertions, 1 deletions
diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index d3086921b..ff27a9dfb 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -94,7 +94,8 @@ processing will proceed even if an individual RLP-file import failure occurs.`,
Requires a first argument of the file to write to.
Optional second and third arguments control the first and
last block to write. In this mode, the file will be appended
-if already existing.`,
+if already existing. If the file ends with .gz, the output will
+be gzipped.`,
}
importPreimagesCommand = cli.Command{
Action: utils.MigrateFlags(importPreimages),