diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76527c73380..a5039789c6e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,9 @@ release.
 
 ### Compatibility
 
+- Prometheus compatibility: Clarify naming of the target info metric, and differences between various prometheus formats.
+  ([#3871](https://github.com/open-telemetry/opentelemetry-specification/pull/3871))
+
 ### SDK Configuration
 
 - Add file configuration section to spec compliance matrix.