diff --git a/errors_test.go b/errors_test.go
index 574865e..d1871e5 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -328,18 +328,18 @@ func TestStackTrace_Good(t *testing.T) {
 	assert.Equal(t, "op3 -> op2 -> op1", formatted)
 }
 
-func TestStackTrace_PlainError(t *testing.T) {
+func TestStackTrace_Bad_PlainError(t *testing.T) {
 	err := errors.New("plain error")
 	assert.Empty(t, StackTrace(err))
 	assert.Empty(t, FormatStackTrace(err))
 }
 
-func TestStackTrace_Nil(t *testing.T) {
+func TestStackTrace_Bad_Nil(t *testing.T) {
 	assert.Empty(t, StackTrace(nil))
 	assert.Empty(t, FormatStackTrace(nil))
 }
 
-func TestStackTrace_NoOp(t *testing.T) {
+func TestStackTrace_Bad_NoOp(t *testing.T) {
 	err := &Err{Msg: "no op"}
 	assert.Empty(t, StackTrace(err))
 	assert.Empty(t, FormatStackTrace(err))
diff --git a/log.go b/log.go
index be73deb..53f6759 100644
--- a/log.go
+++ b/log.go
@@ -59,13 +59,18 @@ type Logger struct {
 	// RedactKeys is a list of keys whose values should be masked in logs.
 	redactKeys []string
 
-	// Style functions for formatting (can be overridden)
+	// StyleTimestamp formats the rendered timestamp prefix.
 	StyleTimestamp func(string) string
-	StyleDebug     func(string) string
-	StyleInfo      func(string) string
-	StyleWarn      func(string) string
-	StyleError     func(string) string
-	StyleSecurity  func(string) string
+	// StyleDebug formats the debug level prefix.
+	StyleDebug func(string) string
+	// StyleInfo formats the info level prefix.
+	StyleInfo func(string) string
+	// StyleWarn formats the warning level prefix.
+	StyleWarn func(string) string
+	// StyleError formats the error level prefix.
+	StyleError func(string) string
+	// StyleSecurity formats the security event prefix.
+	StyleSecurity func(string) string
 }
 
 // RotationOptions defines the log rotation and retention policy.
@@ -93,6 +98,7 @@ type RotationOptions struct {
 
 // Options configures a Logger.
 type Options struct {
+	// Level controls which messages are emitted.
 	Level Level
 	// Output is the destination for log messages. If Rotation is provided,
 	// Output is ignored and logs are written to the rotating file instead.
diff --git a/log_test.go b/log_test.go
index eec88f4..fa57312 100644
--- a/log_test.go
+++ b/log_test.go
@@ -12,7 +12,7 @@ type nopWriteCloser struct{ goio.Writer }
 
 func (nopWriteCloser) Close() error { return nil }
 
-func TestLogger_Levels(t *testing.T) {
+func TestLogger_Levels_Good(t *testing.T) {
 	tests := []struct {
 		name     string
 		level    Level
@@ -62,7 +62,7 @@ func TestLogger_Levels(t *testing.T) {
 	}
 }
 
-func TestLogger_KeyValues(t *testing.T) {
+func TestLogger_KeyValues_Good(t *testing.T) {
 	var buf bytes.Buffer
 	l := New(Options{Level: LevelDebug, Output: &buf})
 
@@ -80,7 +80,7 @@ func TestLogger_KeyValues(t *testing.T) {
 	}
 }
 
-func TestLogger_ErrorContext(t *testing.T) {
+func TestLogger_ErrorContext_Good(t *testing.T) {
 	var buf bytes.Buffer
 	l := New(Options{Output: &buf, Level: LevelInfo})
 
@@ -98,7 +98,7 @@ func TestLogger_ErrorContext(t *testing.T) {
 	}
 }
 
-func TestLogger_Redaction(t *testing.T) {
+func TestLogger_Redaction_Good(t *testing.T) {
 	var buf bytes.Buffer
 	l := New(Options{
 		Level:      LevelInfo,
@@ -120,7 +120,7 @@ func TestLogger_Redaction(t *testing.T) {
 	}
 }
 
-func TestLogger_InjectionPrevention(t *testing.T) {
+func TestLogger_InjectionPrevention_Good(t *testing.T) {
 	var buf bytes.Buffer
 	l := New(Options{Level: LevelInfo, Output: &buf})
 
@@ -137,7 +137,7 @@ func TestLogger_InjectionPrevention(t *testing.T) {
 	}
 }
 
-func TestLogger_SetLevel(t *testing.T) {
+func TestLogger_SetLevel_Good(t *testing.T) {
 	l := New(Options{Level: LevelInfo})
 
 	if l.Level() != LevelInfo {
@@ -150,7 +150,7 @@ func TestLogger_SetLevel(t *testing.T) {
 	}
 }
 
-func TestLevel_String(t *testing.T) {
+func TestLevel_String_Good(t *testing.T) {
 	tests := []struct {
 		level    Level
 		expected string
@@ -172,7 +172,7 @@ func TestLevel_String(t *testing.T) {
 	}
 }
 
-func TestLogger_Security(t *testing.T) {
+func TestLogger_Security_Good(t *testing.T) {
 	var buf bytes.Buffer
 	l := New(Options{Level: LevelError, Output: &buf})