diff --git a/pkg/captcha/db.go b/pkg/captcha/db.go
index 917afef..5095242 100644
--- a/pkg/captcha/db.go
+++ b/pkg/captcha/db.go
@@ -115,6 +115,7 @@ func (cdb *CaptchaDB) IsSolved(id ID) (bool, error) {
 	return false, errorNotFound
 }
 
+// GetExpiry returns time for how long captcha will last.
 func (cdb *CaptchaDB) GetExpiry() time.Duration {
 	return cdb.ExpireIn
 }