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-rw-r--r--ext/fiddle/function.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/fiddle/function.c b/ext/fiddle/function.c
index f657d29fe2..772c09adcb 100644
--- a/ext/fiddle/function.c
+++ b/ext/fiddle/function.c
@@ -272,7 +272,9 @@ Init_fiddle_function(void)
/*
* Document-method: call
*
- * Calls the constructed Function, with +args+
+ * Calls the constructed Function, with +args+.
+ * Caller must ensure the underlying function is called in a
+ * thread-safe manner if running in a multi-threaded process.
*
* For an example see Fiddle::Function
*