diff --git a/README.md b/README.md
index 1bf00e9..0402abd 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,11 @@ Some of the examples demonstrate concurrent code which has a non-deterministic
 execution order. It depends on how the Go runtime schedules its goroutines and
 may vary by operating system, CPU architecture, or even Go version.
 
+Similarly, examples that iterate over maps may produce items in a different order
+from what you're getting on your machine. This is because the order of iteration
+over maps in Go is [not specified and is not guaranteed to be the same from one
+iteration to the next.](https://go.dev/ref/spec#RangeClause).
+
 It doesn't mean anything is wrong with the example. Typically the code in these
 examples will be insensitive to the actual order of the output; if the code is
 sensitive to the order - that's probably a bug - so feel free to report it.