diff --git a/README.md b/README.md
index 53d7865..bd279ee 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,7 @@
 - Formatting: `./format.sh`
 - Building: `make`
 - Running: `./program.out`
+
+## Implementation
+
+- median calculation uses ``std::nth_element`` of `<algorithm>` header
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