diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index fc5d33fc185..7c0ad6021c2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -69,10 +69,16 @@ Once you did, you should run `make help-update`
 
 # Documentation
 
+## Opts
+
 When adding new options, you should declare the defaults in the main `nvim-tree.lua` file.
 
 Documentation for options should also be added to `nvim-tree-opts` in `doc/nvim-tree-lua.txt`
 
+## API
+
+When adding or changing API please update :help nvim-tree-api
+
 # Pull Request
 
 Please reference any issues in the description e.g. "resolves #1234".
diff --git a/doc/nvim-tree-lua.txt b/doc/nvim-tree-lua.txt
index b49da09ba04..426846d5dce 100644
--- a/doc/nvim-tree-lua.txt
+++ b/doc/nvim-tree-lua.txt
@@ -57,6 +57,9 @@ CONTENTS                                                           *nvim-tree*
  13. Legacy                                   |nvim-tree-legacy|
  13.1  Legacy: Opts                             |nvim-tree-legacy-opts|
  13.2  Legacy: Highlight                        |nvim-tree-legacy-highlight|
+ 14. Index                                    |nvim-tree-index|
+ 14.1  Index: Opts                              |nvim-tree-index-opts|
+ 14.2  Index: API                               |nvim-tree-index-api|
 
 ==============================================================================
  1. INTRODUCTION                                      *nvim-tree-introduction*
@@ -2710,4 +2713,265 @@ highlight group is not, hard linking as follows: >
     NvimTreeLspDiagnosticsInformationFolderText NvimTreeDiagnosticInfoFolderHL
     NvimTreeLspDiagnosticsHintFolderText        NvimTreeDiagnosticHintFolderHL
 <
+==============================================================================
+ 14 INDEX                                                    *nvim-tree-index*
+
+==============================================================================
+ 14.1 INDEX: OPTS                                       *nvim-tree-index-opts*
+
+|nvim-tree.actions.change_dir|
+|nvim-tree.actions.change_dir.enable|
+|nvim-tree.actions.change_dir.global|
+|nvim-tree.actions.change_dir.restrict_above_cwd|
+|nvim-tree.actions.expand_all|
+|nvim-tree.actions.expand_all.exclude|
+|nvim-tree.actions.expand_all.max_folder_discovery|
+|nvim-tree.actions.file_popup|
+|nvim-tree.actions.file_popup.open_win_config|
+|nvim-tree.actions.open_file|
+|nvim-tree.actions.open_file.eject|
+|nvim-tree.actions.open_file.quit_on_open|
+|nvim-tree.actions.open_file.resize_window|
+|nvim-tree.actions.open_file.window_picker|
+|nvim-tree.actions.open_file.window_picker.chars|
+|nvim-tree.actions.open_file.window_picker.enable|
+|nvim-tree.actions.open_file.window_picker.exclude|
+|nvim-tree.actions.open_file.window_picker.picker|
+|nvim-tree.actions.remove_file.close_window|
+|nvim-tree.actions.use_system_clipboard|
+|nvim-tree.auto_reload_on_write|
+|nvim-tree.diagnostics.debounce_delay|
+|nvim-tree.diagnostics.enable|
+|nvim-tree.diagnostics.icons|
+|nvim-tree.diagnostics.severity|
+|nvim-tree.diagnostics.severity.max|
+|nvim-tree.diagnostics.severity.min|
+|nvim-tree.diagnostics.show_on_dirs|
+|nvim-tree.diagnostics.show_on_open_dirs|
+|nvim-tree.disable_netrw|
+|nvim-tree.experimental|
+|nvim-tree.filesystem_watchers.debounce_delay|
+|nvim-tree.filesystem_watchers.enable|
+|nvim-tree.filesystem_watchers.ignore_dirs|
+|nvim-tree.filters.custom|
+|nvim-tree.filters.dotfiles|
+|nvim-tree.filters.exclude|
+|nvim-tree.filters.git_clean|
+|nvim-tree.filters.git_ignored|
+|nvim-tree.filters.no_bookmark|
+|nvim-tree.filters.no_buffer|
+|nvim-tree.git.cygwin_support|
+|nvim-tree.git.disable_for_dirs|
+|nvim-tree.git.enable|
+|nvim-tree.git.show_on_dirs|
+|nvim-tree.git.show_on_open_dirs|
+|nvim-tree.git.timeout|
+|nvim-tree.help.sort_by|
+|nvim-tree.hijack_cursor|
+|nvim-tree.hijack_directories.auto_open|
+|nvim-tree.hijack_directories.enable|
+|nvim-tree.hijack_netrw|
+|nvim-tree.hijack_unnamed_buffer_when_opening|
+|nvim-tree.live_filter.always_show_folders|
+|nvim-tree.live_filter.prefix|
+|nvim-tree.log.enable|
+|nvim-tree.log.truncate|
+|nvim-tree.log.types|
+|nvim-tree.log.types.all|
+|nvim-tree.log.types.config|
+|nvim-tree.log.types.copy_paste|
+|nvim-tree.log.types.dev|
+|nvim-tree.log.types.diagnostics|
+|nvim-tree.log.types.git|
+|nvim-tree.log.types.profile|
+|nvim-tree.log.types.watcher|
+|nvim-tree.modified.enable|
+|nvim-tree.modified.show_on_dirs|
+|nvim-tree.modified.show_on_open_dirs|
+|nvim-tree.notify.threshold|
+|nvim-tree.on_attach|
+|nvim-tree.prefer_startup_root|
+|nvim-tree.reload_on_bufenter|
+|nvim-tree.renderer.add_trailing|
+|nvim-tree.renderer.full_name|
+|nvim-tree.renderer.group_empty|
+|nvim-tree.renderer.highlight_bookmarks|
+|nvim-tree.renderer.highlight_clipboard|
+|nvim-tree.renderer.highlight_diagnostics|
+|nvim-tree.renderer.highlight_git|
+|nvim-tree.renderer.highlight_modified|
+|nvim-tree.renderer.highlight_opened_files|
+|nvim-tree.renderer.icons|
+|nvim-tree.renderer.icons.bookmarks_placement|
+|nvim-tree.renderer.icons.diagnostics_placement|
+|nvim-tree.renderer.icons.git_placement|
+|nvim-tree.renderer.icons.glyphs|
+|nvim-tree.renderer.icons.glyphs.default|
+|nvim-tree.renderer.icons.glyphs.folder|
+|nvim-tree.renderer.icons.glyphs.git|
+|nvim-tree.renderer.icons.glyphs.modified|
+|nvim-tree.renderer.icons.glyphs.symlink|
+|nvim-tree.renderer.icons.modified_placement|
+|nvim-tree.renderer.icons.padding|
+|nvim-tree.renderer.icons.show|
+|nvim-tree.renderer.icons.show.bookmarks|
+|nvim-tree.renderer.icons.show.diagnostics|
+|nvim-tree.renderer.icons.show.file|
+|nvim-tree.renderer.icons.show.folder|
+|nvim-tree.renderer.icons.show.folder_arrow|
+|nvim-tree.renderer.icons.show.git|
+|nvim-tree.renderer.icons.show.modified|
+|nvim-tree.renderer.icons.symlink_arrow|
+|nvim-tree.renderer.icons.web_devicons|
+|nvim-tree.renderer.icons.web_devicons.file|
+|nvim-tree.renderer.icons.web_devicons.file.color|
+|nvim-tree.renderer.icons.web_devicons.file.enable|
+|nvim-tree.renderer.icons.web_devicons.folder|
+|nvim-tree.renderer.icons.web_devicons.folder.color|
+|nvim-tree.renderer.icons.web_devicons.folder.enable|
+|nvim-tree.renderer.indent_markers|
+|nvim-tree.renderer.indent_markers.enable|
+|nvim-tree.renderer.indent_markers.icons|
+|nvim-tree.renderer.indent_markers.inline_arrows|
+|nvim-tree.renderer.indent_width|
+|nvim-tree.renderer.root_folder_label|
+|nvim-tree.renderer.special_files|
+|nvim-tree.renderer.symlink_destination|
+|nvim-tree.respect_buf_cwd|
+|nvim-tree.root_dirs|
+|nvim-tree.select_prompts|
+|nvim-tree.sort.files_first|
+|nvim-tree.sort.folders_first|
+|nvim-tree.sort.sorter|
+|nvim-tree.sync_root_with_cwd|
+|nvim-tree.system_open.args|
+|nvim-tree.system_open.cmd|
+|nvim-tree.tab.sync|
+|nvim-tree.tab.sync.close|
+|nvim-tree.tab.sync.ignore|
+|nvim-tree.tab.sync.open|
+|nvim-tree.trash.cmd|
+|nvim-tree.ui.confirm|
+|nvim-tree.ui.confirm.default_yes|
+|nvim-tree.ui.confirm.remove|
+|nvim-tree.ui.confirm.trash|
+|nvim-tree.update_focused_file.enable|
+|nvim-tree.update_focused_file.ignore_list|
+|nvim-tree.update_focused_file.update_root|
+|nvim-tree.view.centralize_selection|
+|nvim-tree.view.cursorline|
+|nvim-tree.view.debounce_delay|
+|nvim-tree.view.float|
+|nvim-tree.view.float.enable|
+|nvim-tree.view.float.open_win_config|
+|nvim-tree.view.float.quit_on_focus_loss|
+|nvim-tree.view.number|
+|nvim-tree.view.preserve_window_proportions|
+|nvim-tree.view.relativenumber|
+|nvim-tree.view.side|
+|nvim-tree.view.signcolumn|
+|nvim-tree.view.width|
+|nvim-tree.view.width.max|
+|nvim-tree.view.width.min|
+|nvim-tree.view.width.padding|
+
+==============================================================================
+ 14.2 INDEX: API                                         *nvim-tree-index-api*
+
+|nvim-tree-api.commands.get()|
+|nvim-tree-api.config.mappings.default_on_attach()|
+|nvim-tree-api.config.mappings.get_keymap()|
+|nvim-tree-api.config.mappings.get_keymap_default()|
+|nvim-tree-api.diagnostics.hi_test()|
+|nvim-tree-api.events.subscribe()|
+|nvim-tree-api.fs.clear_clipboard()|
+|nvim-tree-api.fs.copy.absolute_path()|
+|nvim-tree-api.fs.copy.filename()|
+|nvim-tree-api.fs.copy.node()|
+|nvim-tree-api.fs.copy.relative_path()|
+|nvim-tree-api.fs.create()|
+|nvim-tree-api.fs.cut()|
+|nvim-tree-api.fs.paste()|
+|nvim-tree-api.fs.print_clipboard()|
+|nvim-tree-api.fs.remove()|
+|nvim-tree-api.fs.rename()|
+|nvim-tree-api.fs.rename_basename()|
+|nvim-tree-api.fs.rename_full()|
+|nvim-tree-api.fs.rename_node()|
+|nvim-tree-api.fs.rename_sub()|
+|nvim-tree-api.fs.trash()|
+|nvim-tree-api.git.reload()|
+|nvim-tree-api.live_filter.clear()|
+|nvim-tree-api.live_filter.start()|
+|nvim-tree-api.marks.bulk.delete()|
+|nvim-tree-api.marks.bulk.move()|
+|nvim-tree-api.marks.bulk.trash()|
+|nvim-tree-api.marks.clear()|
+|nvim-tree-api.marks.get()|
+|nvim-tree-api.marks.list()|
+|nvim-tree-api.marks.navigate.next()|
+|nvim-tree-api.marks.navigate.prev()|
+|nvim-tree-api.marks.navigate.select()|
+|nvim-tree-api.marks.toggle()|
+|nvim-tree-api.node.navigate.diagnostics.next()|
+|nvim-tree-api.node.navigate.diagnostics.next_recursive()|
+|nvim-tree-api.node.navigate.diagnostics.prev()|
+|nvim-tree-api.node.navigate.diagnostics.prev_recursive()|
+|nvim-tree-api.node.navigate.git.next()|
+|nvim-tree-api.node.navigate.git.next_recursive()|
+|nvim-tree-api.node.navigate.git.next_skip_gitignored()|
+|nvim-tree-api.node.navigate.git.prev()|
+|nvim-tree-api.node.navigate.git.prev_recursive()|
+|nvim-tree-api.node.navigate.git.prev_skip_gitignored()|
+|nvim-tree-api.node.navigate.opened.next()|
+|nvim-tree-api.node.navigate.opened.prev()|
+|nvim-tree-api.node.navigate.parent()|
+|nvim-tree-api.node.navigate.parent_close()|
+|nvim-tree-api.node.navigate.sibling.first()|
+|nvim-tree-api.node.navigate.sibling.last()|
+|nvim-tree-api.node.navigate.sibling.next()|
+|nvim-tree-api.node.navigate.sibling.prev()|
+|nvim-tree-api.node.open.drop()|
+|nvim-tree-api.node.open.edit()|
+|nvim-tree-api.node.open.horizontal()|
+|nvim-tree-api.node.open.no_window_picker()|
+|nvim-tree-api.node.open.preview()|
+|nvim-tree-api.node.open.preview_no_picker()|
+|nvim-tree-api.node.open.replace_tree_buffer()|
+|nvim-tree-api.node.open.tab()|
+|nvim-tree-api.node.open.tab_drop()|
+|nvim-tree-api.node.open.toggle_group_empty()|
+|nvim-tree-api.node.open.vertical()|
+|nvim-tree-api.node.run.cmd()|
+|nvim-tree-api.node.run.system()|
+|nvim-tree-api.node.show_info_popup()|
+|nvim-tree-api.tree.change_root()|
+|nvim-tree-api.tree.change_root_to_node()|
+|nvim-tree-api.tree.change_root_to_parent()|
+|nvim-tree-api.tree.close()|
+|nvim-tree-api.tree.close_in_all_tabs()|
+|nvim-tree-api.tree.close_in_this_tab()|
+|nvim-tree-api.tree.collapse_all()|
+|nvim-tree-api.tree.expand_all()|
+|nvim-tree-api.tree.find_file()|
+|nvim-tree-api.tree.focus()|
+|nvim-tree-api.tree.get_nodes()|
+|nvim-tree-api.tree.get_node_under_cursor()|
+|nvim-tree-api.tree.is_tree_buf()|
+|nvim-tree-api.tree.is_visible()|
+|nvim-tree-api.tree.open()|
+|nvim-tree-api.tree.reload()|
+|nvim-tree-api.tree.search_node()|
+|nvim-tree-api.tree.toggle()|
+|nvim-tree-api.tree.toggle_custom_filter()|
+|nvim-tree-api.tree.toggle_git_clean_filter()|
+|nvim-tree-api.tree.toggle_gitignore_filter()|
+|nvim-tree-api.tree.toggle_help()|
+|nvim-tree-api.tree.toggle_hidden_filter()|
+|nvim-tree-api.tree.toggle_no_bookmark_filter()|
+|nvim-tree-api.tree.toggle_no_buffer_filter()|
+|nvim-tree-api.tree.winid()|
+
+==============================================================================
+
  vim:tw=78:ts=4:sw=4:et:ft=help:norl:
diff --git a/scripts/help-update.sh b/scripts/help-update.sh
index 3fa00e907af..00d92ff2df2 100755
--- a/scripts/help-update.sh
+++ b/scripts/help-update.sh
@@ -21,6 +21,39 @@ sed -e "s/^  /      /" /tmp/DEFAULT_OPTS.2.lua > /tmp/DEFAULT_OPTS.6.lua
 sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/DEFAULT_OPTS.6.lua
            }; /${end}/p; d; }" doc/nvim-tree-lua.txt
 
+
+#
+# opts index
+#
+begin="nvim-tree-index-opts\*"
+end="====================="
+
+printf '\n' > /tmp/index-opts.txt
+sed -E "
+/^ *\*(nvim-tree\..*)\*$/! d ;
+s/^.*\*(.*)\*/|\1|/g
+" doc/nvim-tree-lua.txt | sort -d >> /tmp/index-opts.txt
+printf '\n' >> /tmp/index-opts.txt
+
+sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/index-opts.txt
+           }; /${end}/p; d; }" doc/nvim-tree-lua.txt
+
+#
+# api index
+#
+begin="nvim-tree-index-api\*"
+end="====================="
+
+printf '\n' > /tmp/index-api.txt
+sed -E "
+/\*(nvim-tree-api.*\(\))\*/! d ;
+s/^.*\*(.*)\*/|\1|/g
+" doc/nvim-tree-lua.txt | sort -d >> /tmp/index-api.txt
+printf '\n' >> /tmp/index-api.txt
+
+sed -i -e "/${begin}/,/${end}/{ /${begin}/{p; r /tmp/index-api.txt
+           }; /${end}/p; d; }" doc/nvim-tree-lua.txt
+
 #
 # DEFAULT_ON_ATTACH
 #