diff --git a/command.go b/command.go
index f8c347c..a188b87 100644
--- a/command.go
+++ b/command.go
@@ -27,7 +27,7 @@ func (c *command) errorWithFallback(ctx context.Context, err error) {
 
 	// collect prometheus metrics
 	elapsed := c.start.Sub(time.Now()).Seconds()
-	requests.WithLabelValues(c.name, errorToEvent(err)).Inc()
+	requests.WithLabelValues(c.name, ErrorToEvent(err)).Inc()
 	requestLatencyHistogram.WithLabelValues(c.name).Observe(elapsed)
 
 	// run returns nil means everything is ok
@@ -53,7 +53,8 @@ func (c *command) errorWithFallback(ctx context.Context, err error) {
 	requests.WithLabelValues(c.name, "fallback-success").Inc()
 }
 
-func errorToEvent(err error) string {
+// ErrorToEvent converts error to event
+func ErrorToEvent(err error) string {
 	event := "failure"
 	switch err {
 	case nil:
diff --git a/command_test.go b/command_test.go
index 49ffc79..92e6166 100644
--- a/command_test.go
+++ b/command_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 func TestErrorToEvent(t *testing.T) {
-	assert.Equal(t, "too-many-requests", errorToEvent(gobreaker.ErrTooManyRequests))
-	assert.Equal(t, "circuit-open", errorToEvent(gobreaker.ErrOpenState))
-	assert.Equal(t, "success", errorToEvent(nil))
+	assert.Equal(t, "too-many-requests", ErrorToEvent(gobreaker.ErrTooManyRequests))
+	assert.Equal(t, "circuit-open", ErrorToEvent(gobreaker.ErrOpenState))
+	assert.Equal(t, "success", ErrorToEvent(nil))
 }