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-rw-r--r--lib/system.nim2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/system.nim b/lib/system.nim
index 4080fee06..6e8519cf6 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -473,6 +473,8 @@ proc shallowCopy*[T](x: var T, y: T) {.noSideEffect, magic: "ShallowCopy".}
   ## Be careful with the changed semantics though!
   ## There is a reason why the default assignment does a deep copy of sequences
   ## and strings.
+  ##
+  ## .. warning:: `shallowCopy` does a deep copy with ARC/ORC.
 
 # :array|openArray|string|seq|cstring|tuple
 proc `[]`*[I: Ordinal;T](a: T; i: I): T {.