Update README.md

ethlo · web-flow · commit 5746ce3b4344 · 2019-08-15T18:35:33.000+02:00
diff --git a/README.md b/README.md
@@ -51,3 +51,10 @@ Example output:
 | Total: 353.98m                                                               |
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 ```
+
+## Limitations
+This project is utilizing `System.nanoTime()` which has some inherent issues with very quick task times. It does have a nanosecond resolution, but not a nanosecond precision. These are still usually orders of magnitude away from what you are trying to measure, so it is not a problem. If you are micro-benchmarking, consider using a framework like [JMH](https://mvnrepository.com/artifact/org.openjdk.jmh/jmh-core)
+
+If you would like to know more:
+* https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/System.html#nanoTime()
+* https://shipilev.net/blog/2014/nanotrusting-nanotime/#_timers
