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diff --git a/src/tree.h b/src/tree.h
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+/*
+Copyright 2015-2022 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/* Trees */
+
+#ifndef TREE_H
+#define TREE_H
+
+#include "types.h"
+
+int init_Tree(Tree* tree, int memory_children, int memory_label);
+int free_Tree(Tree tree);
+
+// copy
+int tree_cpy(Tree input, Tree* output);
+int tree_cpy_noinit(Tree input, Tree* output);
+
+// resize memory
+int tree_resize(Tree* tree, int newsize);
+
+// set label
+int tree_set_label(Char_Array label, Tree* tree);
+
+// add a child to a tree
+int tree_append_child(Tree tree, Tree* output);
+// add a child to a tree without allocating memory for the new child
+int tree_append_child_noinit(Tree tree, Tree* output);
+
+// concatenate the children of two trees
+int tree_concat_children(Tree input, Tree* output);
+// noinit
+int tree_concat_children_noinit(Tree input, Tree* output);
+
+#endif
+