diff --git a/Tips-and-tricks.md b/Tips-and-tricks.md
index 031df24..66d8040 100644
--- a/Tips-and-tricks.md
+++ b/Tips-and-tricks.md
@@ -29,4 +29,10 @@ when isMainModule:
 
 ## How do I echo in a ``{.noSideEffect.}`` proc?
 
-You can use ``debugEcho`` for this.
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+You can use ``debugEcho`` for this.
+
+## Language details
+
+#### Shallow vs. DeepCopy
+
+* https://forum.nim-lang.org/t/2665#16487
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