diff --git a/CHANGELOG.md b/CHANGELOG.md
index e205735c..9592c8c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ The full list of changes can be found in the compare view for the respective rel
 
 ### Fixed
 
+- logs: `SEVERITY_NUMBER_UNSPECIFIED` can be used as the `severity_number` field is optional. [#736](https://github.com/open-telemetry/opentelemetry-proto/pull/736)
+
 ### Removed
 
 ## 1.9.0 - 2025-10-31
diff --git a/opentelemetry/proto/logs/v1/logs.proto b/opentelemetry/proto/logs/v1/logs.proto
index 842c93c1..a6597d1e 100644
--- a/opentelemetry/proto/logs/v1/logs.proto
+++ b/opentelemetry/proto/logs/v1/logs.proto
@@ -85,7 +85,6 @@ message ScopeLogs {
 
 // Possible values for LogRecord.SeverityNumber.
 enum SeverityNumber {
-  // UNSPECIFIED is the default SeverityNumber, it MUST NOT be used.
   SEVERITY_NUMBER_UNSPECIFIED = 0;
   SEVERITY_NUMBER_TRACE  = 1;
   SEVERITY_NUMBER_TRACE2 = 2;