diff --git a/crates/nu-command/src/filters/flatten.rs b/crates/nu-command/src/filters/flatten.rs
index bc2e1e392..060c8b74d 100644
--- a/crates/nu-command/src/filters/flatten.rs
+++ b/crates/nu-command/src/filters/flatten.rs
@@ -29,7 +29,7 @@ impl Command for Flatten {
                 SyntaxShape::String,
                 "optionally flatten data by column",
             )
-            .switch("all", "flatten inner table out", Some('a'))
+            .switch("all", "flatten inner table one level out", Some('a'))
             .category(Category::Filters)
     }