diff --git a/foundry.toml b/foundry.toml
index 9365a77..fc73de2 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -1,4 +1,8 @@
-[package]
+# Release metadata, not foundry config. `rainix-autopublish` reads `version` as
+# the next, unpublished Soldeer release and rewrites it when it publishes.
+# `[external.*]` is the section foundry reserves for another tool's config and
+# ignores; any other unreserved section it reads as a profile and warns about.
+[external.package]
 name = "rain-math-binary"
 version = "0.1.5"