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-rw-r--r--src/nix-help.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nix-help.txt b/src/nix-help.txt
index a51018ea1930..ceff114ae507 100644
--- a/src/nix-help.txt
+++ b/src/nix-help.txt
@@ -24,6 +24,7 @@ Query flags:
   --list / -l: query the output paths (roots) of a Nix expression (default)
   --requisites / -r: print all paths necessary to realise expression
   --generators / -g: find expressions producing a subset of given ids
+  --predecessors: print predecessors of a Nix expression
   --graph: print a dot graph rooted at given ids
 
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