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-rw-r--r--src/libexpr/nix.sdf3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/nix.sdf b/src/libexpr/nix.sdf
index 8623d1d1469a..2b99cf09a472 100644
--- a/src/libexpr/nix.sdf
+++ b/src/libexpr/nix.sdf
@@ -1,3 +1,6 @@
+%% Note: this SDF grammar is no longer used in the Nix expression
+%% parser and may not be up to date.
+
 definition