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-rw-r--r--src/nix-hash/help.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nix-hash/help.txt b/src/nix-hash/help.txt
index 31fff1ffabd6..082cc7571c06 100644
--- a/src/nix-hash/help.txt
+++ b/src/nix-hash/help.txt
@@ -6,3 +6,4 @@ files.
   --flat: compute hash of regular file contents, not metadata
   --base32: print hash in base-32 instead of hexadecimal
   --type HASH: use hash algorithm HASH ("md5" (default), "sha1", "sha256")
+  --truncate: truncate the hash to 160 bits