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-rw-r--r--src/vhdl/vhdl-nodes.ads2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/vhdl/vhdl-nodes.ads b/src/vhdl/vhdl-nodes.ads
index e34192932..aaf640389 100644
--- a/src/vhdl/vhdl-nodes.ads
+++ b/src/vhdl/vhdl-nodes.ads
@@ -7389,6 +7389,8 @@ package Vhdl.Nodes is
procedure Free_Iir (Target : Iir);
-- Hooks called when a node is free.
+ -- Note: The register procedure must be called only during elaboration, so
+ -- the set of hooks is defined forever.
type Free_Iir_Hook is access procedure (N : Iir);
procedure Register_Free_Hook (Hook : Free_Iir_Hook);