diff --git a/README.md b/README.md
index 7f0544d..1cfee29 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,8 @@ Scope:
 
 - For JSON, use `jq`.
 
+- For Excel or CSV files, [csvkit](https://github.com/onyxfish/csvkit) provides `in2csv`, `csvcut`, `csvjoin`, `csvgrep`, etc.
+
 - For Amazon S3, [`s3cmd`](https://github.com/s3tools/s3cmd) is convenient and [`s4cmd`](https://github.com/bloomreach/s4cmd) is faster. Amazon's [`aws`](https://github.com/aws/aws-cli) is essential for other AWS-related tasks.
 
 - Know about `sort` and `uniq`, including uniq's `-u` and `-d` options -- see one-liners below.