diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..9da96fc
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+# go/logging
+
+## Unreleased
+
+- Uncompatible change: log level names hace changed. They were fully
+  capitalized, only their first letter is capitalized now: DEBUG -> Debug,
+  INFO -> Info, etc.
diff --git a/logging.go b/logging.go
index 3d0c603..c7d1cb9 100644
--- a/logging.go
+++ b/logging.go
@@ -15,13 +15,13 @@ var (
 type Level byte
 
 const (
-	DEBUG Level = iota
-	INFO
-	WARNING
-	ERROR
-	CRITICAL
-	FATAL
-	DEFAULT_LEVEL = INFO
+	Debug Level = iota
+	Info
+	Warning
+	Error
+	Critical
+	Fatal
+	DefaultLevel = Info
 )
 
 var levelNames = [6]string{"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL", "FATAL"}