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+Test Runtimes
+=============
+
+These files contain test runtimes for various suites across different platforms. Each JSON file
+corresponds to a single test job in production and has the following format:
+
+    { '<test id>': <average runtime> }
+
+These files are being used to normalize chunk durations so all chunks take roughly the same length
+of time. They are still experimental and their format and/or file structure are subject to change
+without notice.
+
+Generating a Test Runtime File
+------------------------------
+
+The writeruntimes.py script can be used to generate a runtime file. You must
+specify the suite for which the runtimes are to be generated, e.g.
+
+    writeruntimes.py -s mochitest-media