diff --git a/README.md b/README.md
index 4bc0dab..fbf0c9f 100644
--- a/README.md
+++ b/README.md
@@ -197,6 +197,9 @@ in production, you can do it like this:
 Leporello.js appends `?leporello` query parameter to your HTML file, so you can
 test if HTML file is run in Leporello.js or in production.
 
+You can add javascript libraries by including `script` tag to HTML file. If the library is exposing globals, they will be available in your javascript code after you select that HTML file as an entrypoint.
+
+
 ## Run and debug UI code in separate window
 
 By default your code is run in invisible iframe. If you want to run and debug
diff --git a/docs/images/entrypoint.png b/docs/images/entrypoint.png
index 90527c3..1c14eb5 100644
Binary files a/docs/images/entrypoint.png and b/docs/images/entrypoint.png differ
diff --git a/docs/images/html_file.png b/docs/images/html_file.png
index ecc42e7..5b57869 100644
Binary files a/docs/images/html_file.png and b/docs/images/html_file.png differ
diff --git a/index.html b/index.html
index 56f108d..14a374f 100644
--- a/index.html
+++ b/index.html
@@ -161,28 +161,6 @@
         overflow: auto;
       }
 
-      .entrypoint_select {
-        overflow: hidden;
-        display: flex;
-        width: fit-content;
-        align-items: center;
-        margin-left: auto;
-        min-height: 55px;
-      }
-
-      .entrypoint_select select {
-        min-width: 20px;
-        flex: 1;
-      }
-
-      .entrypoint_title {
-        margin-right: 0.5em;
-      }
-
-      .entrypoint_title:not(:first-child) {
-        margin-left: 1.5em;
-      }
-
       .callnode {
         margin-left: 1em;
       }
@@ -248,10 +226,20 @@
         margin-left: 0em !important;
       }
 
+      .files .file_title {
+        display: flex;
+      }
+
       .files .file_title.active {
         background-color: rgb(225, 244, 253);
       }
 
+      .files .file_title .select_entrypoint {
+        margin-left: auto;
+        width: 40px;
+        text-align: center;
+      }
+
       .files .file_title .icon {
         display: inline-block;
         margin-right: 5px;
@@ -259,13 +247,27 @@
       }
 
       .file_actions {
+        position: relative;
         display: flex;
         flex-direction: row;
-        justify-content: space-evenly;
+        justify-content: flex-start;
+        align-items: center;
         padding: 5px;
         background-color: rgb(225 244 253 / 80%);
       }
 
+      .file_actions .file_action {
+        margin-right: 2em;
+      }
+
+      .file_actions .select_entrypoint_title {
+        width: 40px;
+        position: absolute; 
+        right: 7px;
+        font-size: 0.8em;
+        text-align: center;
+      }
+
       /* value_explorer */
 
       .embed_value_explorer_container {
diff --git a/src/editor/files.js b/src/editor/files.js
index 776fe39..6931224 100644
--- a/src/editor/files.js
+++ b/src/editor/files.js
@@ -1,7 +1,10 @@
 import {el} from './domutils.js'
 import {map_find} from '../utils.js'
 import {load_dir, create_file} from '../filesystem.js'
-import {exec, get_state, open_directory} from '../index.js'
+import {exec, get_state, open_directory, reload_run_window} from '../index.js'
+
+const is_html = path => path.endsWith('.htm') || path.endsWith('.html')
+const is_js = path => path == '' || path.endsWith('.js') || path.endsWith('.mjs')
 
 export class Files {
   constructor(ui) {
@@ -10,6 +13,18 @@ export class Files {
     this.render(get_state())
   }
 
+  change_entrypoint(e) {
+    const file = e.target.value
+    exec('change_entrypoint', file)
+    this.ui.editor.focus()
+  }
+
+  change_html_file(e) {
+    const html_file = e.target.value
+    exec('change_html_file', html_file)
+    reload_run_window(get_state())
+  }
+
   render(state) {
     if(state.project_dir == null) {
       this.el.innerHTML = ''
@@ -25,32 +40,40 @@ export class Files {
         )
       )
     } else {
-      this.render_files(state.project_dir, state.current_module)
+      this.render_files(state)
     }
   }
 
-  render_files(dir, current_module) {
-    const files = this.el.querySelector('.files')
-
+  render_files(state) {
     const children = [
-      this.render_file({name: '*scratch*', path: ''}, current_module),
-      this.render_file(dir, current_module),
+      this.render_file({name: '*scratch*', path: ''}, state),
+      this.render_file(state.project_dir, state),
     ]
 
+    const files = this.el.querySelector('.files')
+
     if(files == null) {
       this.el.innerHTML = ''
       this.el.appendChild(
         el('div', 'file_actions',
           el('a', {
+            'class': 'file_action',
             href: 'javascript: void(0)', 
             click: this.create_file.bind(this, false),
           }, 
             'Create file'
           ),
           el('a', {
+            'class': 'file_action',
             href: 'javascript: void(0)',
             click: this.create_file.bind(this, true),
           }, 'Create dir'),
+          el('a', {
+            href: 'https://github.com/leporello-js/leporello-js#selecting-entrypoint-module',
+            target: '__blank',
+            "class": 'select_entrypoint_title',
+            title: 'Select entrypoint',
+          }, 'Entry point'),
         )
       )
       this.el.appendChild(
@@ -64,10 +87,40 @@ export class Files {
     }
   }
 
-  render_file(file, current_module) {
+  render_select_entrypoint(file, state) {
+    if(file.kind == 'directory') {
+      return null
+    } else if(is_js(file.path)) {
+      return el('span', 'select_entrypoint',
+        el('input', {
+          type: 'radio', 
+          name: 'js_entrypoint', 
+          value: file.path,
+          checked: state.entrypoint == file.path,
+          change: e => this.change_entrypoint(e),
+          click: e => e.stopPropagation(),
+        })
+      )
+    } else if(is_html(file.path)) {
+      return el('span', 'select_entrypoint',
+        el('input', {
+          type: 'radio', 
+          name: 'html_file', 
+          value: file.path,
+          checked: state.html_file == file.path,
+          change: e => this.change_html_file(e),
+          click: e => e.stopPropagation(),
+        })
+      )
+    } else {
+      return null
+    }
+  }
+
+  render_file(file, state) {
     const result =  el('div', 'file',
       el('div', {
-          'class': 'file_title' + (file.path == current_module ? ' active' : ''), 
+          'class': 'file_title' + (file.path == state.current_module ? ' active' : ''), 
           click: e => this.on_click(e, file)
         }, 
         el('span', 'icon',
@@ -76,13 +129,14 @@ export class Files {
             : '\xa0',
         ),
         file.name, 
+        this.render_select_entrypoint(file, state),
       ),
       file.children == null 
         ? null
-        : file.children.map(c => this.render_file(c, current_module))
+        : file.children.map(c => this.render_file(c, state))
     )
 
-    if(file.path == current_module) {
+    if(file.path == state.current_module) {
       this.active_el = result
       this.active_file = file
     }
diff --git a/src/editor/ui.js b/src/editor/ui.js
index 56a99c3..e8c38ec 100644
--- a/src/editor/ui.js
+++ b/src/editor/ui.js
@@ -1,4 +1,4 @@
-import {exec, get_state, open_run_window, reload_run_window} from '../index.js'
+import {exec, get_state, open_run_window} from '../index.js'
 import {Editor} from './editor.js'
 import {Files} from './files.js'
 import {CallTree} from './calltree.js'
@@ -8,8 +8,6 @@ import {el} from './domutils.js'
 
 export class UI {
   constructor(container, state){
-    this.change_entrypoint = this.change_entrypoint.bind(this)
-    this.change_html_file = this.change_html_file.bind(this)
     this.open_run_window = this.open_run_window.bind(this)
 
     this.files = new Files(this)
@@ -42,7 +40,6 @@ export class UI {
                     href: 'javascript: void(0)',
                   }, 'IO trace (F4)')
                 ),
-                this.entrypoint_select = el('div', 'entrypoint_select')
               ),
               this.debugger.calltree = el('div', {
                 'class': 'tab_content', 
@@ -58,12 +55,10 @@ export class UI {
               }),
             ),
             this.debugger_loading = el('div', 'debugger_wrapper',
-              el('div', 'entrypoint_select'),
               this.debugger_loading_message = el('div'),
             ),
           ),
           this.problems_container = el('div', {"class": 'problems_container', tabindex: 0},
-            el('div', 'entrypoint_select'),
             this.problems = el('div'),
           )
         ),
@@ -194,7 +189,6 @@ export class UI {
     // instead
     this.debugger.calltree.addEventListener('click', jump_to_fn_location)
 
-    this.render_entrypoint_select(state)
     this.render_current_module(state.current_module)
 
     this.set_active_tab('calltree', true)
@@ -216,72 +210,10 @@ export class UI {
     }
   }
 
-  render_entrypoint_select(state) {
-    for(let select of this.root.getElementsByClassName('entrypoint_select')) {
-      this.do_render_entrypoint_select(state, select)
-    }
-  }
-
-  do_render_entrypoint_select(state, select) {
-    select.replaceChildren(
-      el('span', 'entrypoint_title', 'js entrypoint'),
-      el('select', {
-        click: e => e.stopPropagation(),
-        change: this.change_entrypoint,
-      },
-        Object
-          .keys(state.files)
-          .sort()
-          .filter(f => f == '' || f.endsWith('.js') || f.endsWith('.mjs'))
-          .map(f =>
-            el('option', 
-              state.entrypoint == f
-                ? { value: f, selected: true }
-                : { value: f},
-              f == '' ? "*scratch*" : f
-            )
-          )
-      ),
-      el('span', 'entrypoint_title', 'html page'),
-      el('select', {
-        click: e => e.stopPropagation(),
-        change: this.change_html_file,
-      },
-        ['']
-          .concat(
-            Object
-              .keys(state.files)
-              .sort()
-              .filter(f => f.endsWith('.htm') || f.endsWith('.html'))
-          )
-          .map(f =>
-            el('option', 
-              state.html_file == f
-                ? { value: f, selected: true }
-                : { value: f},
-              f == '' ? 'about:blank' : f
-            )
-          )
-      ),
-    )
-  }
-
   open_run_window() {
     open_run_window(get_state())
   }
 
-  change_entrypoint(e) {
-    const file = e.target.value
-    exec('change_entrypoint', file)
-    this.editor.focus()
-  }
-
-  change_html_file(e) {
-    const html_file = e.target.value
-    exec('change_html_file', html_file)
-    reload_run_window(get_state())
-  }
-
   render_debugger_loading(state) {
     this.debugger_container.style = ''
     this.problems_container.style = 'display: none'
diff --git a/src/effects.js b/src/effects.js
index 64d8e20..629ce6f 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -140,16 +140,6 @@ export const apply_side_effects = (prev, next, command, ui) => {
     ui.files.render(next)
   }
 
-  if(
-    prev.project_dir != next.project_dir 
-    || 
-    prev.entrypoint != next.entrypoint
-    ||
-    prev.html_file != next.html_file
-  ) {
-    ui.render_entrypoint_select(next)
-  }
-
   if(prev.current_module != next.current_module) {
     localStorage.current_module = next.current_module
     ui.render_current_module(next.current_module)