diff --git a/core/bean/doc.go b/core/bean/doc.go
index f806a081..049fe563 100644
--- a/core/bean/doc.go
+++ b/core/bean/doc.go
@@ -12,6 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// bean is a basic package
+// Package bean is a basic package
 // it should not depend on other modules except common module, log module and config module
 package bean
diff --git a/core/berror/error.go b/core/berror/error.go
index ca09798a..c40009c6 100644
--- a/core/berror/error.go
+++ b/core/berror/error.go
@@ -25,7 +25,7 @@ import (
 // code, msg
 const errFmt = "ERROR-%d, %s"
 
-// Err returns an error representing c and msg.  If c is OK, returns nil.
+// Error returns an error representing c and msg.  If c is OK, returns nil.
 func Error(c Code, msg string) error {
 	return fmt.Errorf(errFmt, c.Code(), msg)
 }
diff --git a/core/config/config.go b/core/config/config.go
index 95a4eb26..9e84f059 100644
--- a/core/config/config.go
+++ b/core/config/config.go
@@ -53,20 +53,20 @@ import (
 
 // Configer defines how to get and set value from configuration raw data.
 type Configer interface {
-	// support section::key type in given key when using ini type.
+	// Set support section::key type in given key when using ini type.
 	Set(key, val string) error
 
-	// support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
+	// String support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
 	String(key string) (string, error)
-	// get string slice
+	// Strings get string slice
 	Strings(key string) ([]string, error)
 	Int(key string) (int, error)
 	Int64(key string) (int64, error)
 	Bool(key string) (bool, error)
 	Float(key string) (float64, error)
-	// support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
+	// DefaultString support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
 	DefaultString(key string, defaultVal string) string
-	// get string slice
+	// DefaultStrings get string slice
 	DefaultStrings(key string, defaultVal []string) []string
 	DefaultInt(key string, defaultVal int) int
 	DefaultInt64(key string, defaultVal int64) int64
diff --git a/core/config/toml/toml.go b/core/config/toml/toml.go
index 0c678164..d278e8dc 100644
--- a/core/config/toml/toml.go
+++ b/core/config/toml/toml.go
@@ -19,8 +19,6 @@ import (
 	"os"
 	"strings"
 
-	"github.com/pelletier/go-toml"
-
 	"github.com/beego/beego/v2/core/config"
 )
 
@@ -135,7 +133,7 @@ func (c *configContainer) Int64(key string) (int64, error) {
 	}
 }
 
-// bool return bool value
+// Bool return bool value
 // return error if key not found or value is invalid type
 func (c *configContainer) Bool(key string) (bool, error) {
 	res, err := c.get(key)
diff --git a/core/utils/time.go b/core/utils/time.go
index 00d13861..2f813a05 100644
--- a/core/utils/time.go
+++ b/core/utils/time.go
@@ -19,7 +19,7 @@ import (
 	"time"
 )
 
-// short string format
+// ToShortTimeFormat short string format
 func ToShortTimeFormat(d time.Duration) string {
 	u := uint64(d)
 	if u < uint64(time.Second) {