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diff --git a/src/HelpFile b/src/HelpFile
index 147bee228..c28a9d2fc 100644
--- a/src/HelpFile
+++ b/src/HelpFile
@@ -260,6 +260,7 @@ gt, generate_trees: gt Tree?
-metas also return trees that include metavariables
flags:
-depth generate to this depth (default 3)
+ -atoms take this number of atomic rules of each category (default unlimited)
-alts take this number of alternatives at each branch (default unlimited)
-cat generate in this category
-lang use the abstract syntax of this grammar