diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38d68e3..7858e05 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 
 ## Unreleased
-Nothing yet!
+### Added
+- The `doc` debugging command, for viewing documentation on individual HERA operations.
+
 
 ## [0.8.1] - 2019-03-09
 ### Added