diff --git a/README.md b/README.md
index 1b858de1..fb61c868 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,8 @@ jc [OPTIONS] COMMAND
 ```
 The JSON output can be compact (default) or pretty formatted with the `-p` option.
 
+> Note: For best results set `LANG` locale environment variable to `C`. For example, either by setting directly on the command-line: `$ LANG=C date | jc --date`, or by exporting to the environment before running commands: `$ export LANG=C`.
+
 ### Parsers
 - `--airport` enables the `airport -I` command parser (OSX)
 - `--airport-s` enables the `airport -s` command parser (OSX)