README.md in trackler-2.2.1.178

- old
+ new

@@ -29,13 +29,14 @@
 
 The Hamming distance between these two DNA strands is 7.
 
 # Implementation notes
 
-The Hamming distance is only defined for sequences of equal length. This means
-that based on the definition, each language could deal with getting sequences
-of equal length differently.
+The Hamming distance is only defined for sequences of equal length, so
+an attempt to calculate it between sequences of different lengths should
+not work. The general handling of this situation (e.g., raising an
+exception vs returning a special value) may differ between languages.
 
 You may be wondering about the `cases_test.go` file. We explain it in the
 [leap exercise][leap-exercise-readme].
 
 [leap-exercise-readme]: https://github.com/exercism/go/blob/master/exercises/leap/README.md 
@@ -43,13 +44,13 @@
 
 ## Running the tests
 
 To run the tests run the command `go test` from within the exercise directory.
 
-If the test suite contains benchmarks, you can run these with the `-bench`
-flag:
+If the test suite contains benchmarks, you can run these with the `--bench` and `--benchmem`
+flags:
 
-    go test -bench .
+    go test -v --bench . --benchmem
 
 Keep in mind that each reviewer will run benchmarks on a different machine, with
 different specs, so the results from these benchmark tests may vary.
 
 ## Further information