| Index: tools/metrics/histograms/histograms.xml | 
| diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml | 
| index 9feb3ec0d329b18716865e75508cb92ee9709ac2..ef6627143d22b9a1d82d4b570d57f6e6d6b20556 100644 | 
| --- a/tools/metrics/histograms/histograms.xml | 
| +++ b/tools/metrics/histograms/histograms.xml | 
| @@ -8,6 +8,10 @@ found in the LICENSE file. | 
| This file is used to generate a comprehensive list of Chrome histograms along | 
| with a detailed description for each histogram. | 
|  | 
| +For best practices on writing histogram descriptions, see README.md in this | 
| +directory.  For details on how to modify this file to add your description, | 
| +keep reading. | 
| + | 
| Please pretty-print and validate your edits by running the pretty_print.py | 
| and validate_format.py scripts in the same directory as this file before | 
| uploading your change for review. | 
|  |