diff --git a/form/field.go b/form/field.go
index f1558c2..fe63326 100644
--- a/form/field.go
+++ b/form/field.go
@@ -158,6 +158,7 @@ func (f *Field) WithOptions(options ...*Option) *Field {
 	return f
 }
 
+// Remove an option if exists
 func (f *Field) RemoveOption(name string) *Field {
 	var options []*Option
 
@@ -377,6 +378,7 @@ func (f *Field) Bind(data map[string]any, key *string, parentIsSlice bool) error
 	return nil
 }
 
+// Generates a tree of errors
 func (f *Field) ErrorsTree(tree map[string]any, key *string) {
 	var index string
 
diff --git a/form/field_collection.go b/form/field_collection.go
index 52b8e02..3f3ece1 100644
--- a/form/field_collection.go
+++ b/form/field_collection.go
@@ -1,10 +1,5 @@
 package form
 
-import (
-	"fmt"
-	"reflect"
-)
-
 // @license GNU AGPL version 3 or any later version
 //
 // This program is free software: you can redistribute it and/or modify
@@ -20,6 +15,11 @@ import (
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import (
+	"fmt"
+	"reflect"
+)
+
 // Generates a sub form
 func NewFieldCollection(name string) *Field {
 	f := NewField(name, "collection").
diff --git a/form/form.go b/form/form.go
index c17da05..04016d3 100644
--- a/form/form.go
+++ b/form/form.go
@@ -293,6 +293,7 @@ func (f *Form) IsSubmitted() bool {
 	return f.RequestData != nil
 }
 
+// Generates a tree of errors
 func (f *Form) ErrorsTree() map[string]any {
 	errors := make(map[string]any)
 
diff --git a/util/collection.go b/util/collection.go
index 7ee4d66..f0aa649 100644
--- a/util/collection.go
+++ b/util/collection.go
@@ -1,5 +1,20 @@
 package util
 
+// @license GNU AGPL version 3 or any later version
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import (
 	"regexp"
 	"strings"
diff --git a/util/transformer.go b/util/transformer.go
index 743b117..a942fa1 100644
--- a/util/transformer.go
+++ b/util/transformer.go
@@ -1,5 +1,20 @@
 package util
 
+// @license GNU AGPL version 3 or any later version
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import (
 	"fmt"
 	"net/url"