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-rw-r--r--src/Zcu/PerThread.zig3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/Zcu/PerThread.zig b/src/Zcu/PerThread.zig
index b2f6d600e6..700d8708b1 100644
--- a/src/Zcu/PerThread.zig
+++ b/src/Zcu/PerThread.zig
@@ -1,3 +1,6 @@
+//! This type provides a wrapper around a `*Zcu` for uses which require a thread `Id`.
+//! Any operation which mutates `InternPool` state lives here rather than on `Zcu`.
+
zcu: *Zcu,
/// Dense, per-thread unique index.