diff --git a/releases/0.5.6.md b/releases/0.5.6.md
index d948cf6..697075f 100644
--- a/releases/0.5.6.md
+++ b/releases/0.5.6.md
@@ -8,6 +8,7 @@ value for `max_area`
 ### Features
 
 - [More Imagemagick Configuration](#more-imagemagick-configuration)
+- [Metrics Descriptions](#metrics-descriptions)
 
 
 ### Changes
@@ -63,6 +64,13 @@ pict-rs run \
 ```
 
 
+### Metrics Descriptions
+
+pict-rs now has descriptions for each of the metrics it emits. They're all pretty short for now, but
+can be expanded in the future if there's confusion. This is only useful when pict-rs is configured
+to host a prometheus scrape endpoint.
+
+
 ### Imagemagick Area Defaults
 
 The default value for `max_area` has been decreased from 40 million to 20 thousand. The reason for