diff --git a/cobra/cmd/golden_test.go b/cobra/cmd/golden_test.go
index 59a5a1c9..21c31a7a 100644
--- a/cobra/cmd/golden_test.go
+++ b/cobra/cmd/golden_test.go
@@ -61,7 +61,7 @@ func checkLackFiles(expected, got []string) error {
 		}
 	}
 	if len(lacks) > 0 {
-		return fmt.Errorf("Lack %v file(s): %v", len(lacks), lacks)
+		return fmt.Errorf("lack %v file(s): %v", len(lacks), lacks)
 	}
 	return nil
 }
diff --git a/command.go b/command.go
index 34d1bf36..d15309e7 100644
--- a/command.go
+++ b/command.go
@@ -674,7 +674,7 @@ func (c *Command) ArgsLenAtDash() int {
 
 func (c *Command) execute(a []string) (err error) {
 	if c == nil {
-		return fmt.Errorf("Called Execute() on a nil Command")
+		return fmt.Errorf("called Execute() on a nil Command")
 	}
 
 	if len(c.Deprecated) > 0 {