diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd331ea..d98325a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ file is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and
 this project adheres to [Semantic
 Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- Added `source` field to `OpLog`.
+
 ## [0.20.0] - 2024-09-10
 
 ### Changed
diff --git a/src/ingest/log.rs b/src/ingest/log.rs
index 2923f7e..dd2bdae 100644
--- a/src/ingest/log.rs
+++ b/src/ingest/log.rs
@@ -32,6 +32,7 @@ pub struct OpLog {
     pub agent_name: String,
     pub log_level: OpLogLevel,
     pub contents: String,
+    pub source: String,
     // Category, id
 }
 
@@ -46,8 +47,8 @@ impl Display for OpLog {
     fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
         write!(
             f,
-            "{}\t{:?}\t{}",
-            self.agent_name, self.log_level, self.contents
+            "{}\t{:?}\t{}\t{}",
+            self.agent_name, self.log_level, self.contents, self.source
         )
     }
 }