diff --git a/tools/metrics/histograms/metadata/cobalt/enums.xml b/tools/metrics/histograms/metadata/cobalt/enums.xml
index 17bce49759805..c593a7a6f734b 100644
--- a/tools/metrics/histograms/metadata/cobalt/enums.xml
+++ b/tools/metrics/histograms/metadata/cobalt/enums.xml
@@ -37,6 +37,11 @@ https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histogra
   <int value="1" label="True"/>
 </enum>
 
+<enum name="BooleanHasPlayed">
+  <int value="0" label="Never played"/>
+  <int value="1" label="Played"/>
+</enum>
+
 <enum name="PipelineStatus">
   <summary>
    Possible status values reported by the Media Pipeline
diff --git a/tools/metrics/histograms/metadata/cobalt/histograms.xml b/tools/metrics/histograms/metadata/cobalt/histograms.xml
index 29323aafae699..ee2243352908b 100644
--- a/tools/metrics/histograms/metadata/cobalt/histograms.xml
+++ b/tools/metrics/histograms/metadata/cobalt/histograms.xml
@@ -119,15 +119,14 @@ Always run the pretty print utility on this file after editing:
   </summary>
 </histogram>
 
-<histogram name="Cobalt.Media.HasEverPlayed" enum="PipelineStatus"
+<histogram name="Cobalt.Media.HasEverPlayed" enum="BooleanHasPlayed"
     expires_after="never">
 <!-- expires-never: Needed for baseline Media pipeline health metric. -->
 
   <owner>sideboard@google.com</owner>
   <owner>cobalt-team@google.com</owner>
   <summary>
-    Status of the media pipeline at the end of its lifecycle for audio-video
-    streams with an unknown video codec.
+    Whether a given WebMediaPlayer instance, after preload, started playback;
   </summary>
 </histogram>