diff --git a/book/src/keymap.md b/book/src/keymap.md
index 576f6b46..c88ed767 100644
--- a/book/src/keymap.md
+++ b/book/src/keymap.md
@@ -210,25 +210,34 @@ This layer is similar to vim keybindings as kakoune does not support window.
 This layer is a kludge of mappings, mostly pickers.
 
 
-| Key     | Description                                                           | Command                             |
-| -----   | -----------                                                           | -------                             |
-| `f`     | Open file picker                                                      | `file_picker`                       |
-| `b`     | Open buffer picker                                                    | `buffer_picker`                     |
-| `k`     | Show documentation for item under cursor (**LSP**)                    | `hover`                             |
-| `s`     | Open document symbol picker (**LSP**)                                 | `symbol_picker`                     |
-| `S`     | Open workspace symbol picker (**LSP**)                                | `workspace_symbol_picker`           |
-| `r`     | Rename symbol (**LSP**)                                               | `rename_symbol`                     |
-| `a`     | Apply code action  (**LSP**)                                          | `code_action`                       |
-| `'`     | Open last fuzzy picker                                                | `last_picker`                       |
-| `w`     | Enter [window mode](#window-mode)                                     | N/A                                 |
-| `p`     | Paste system clipboard after selections                               | `paste_clipboard_after`             |
-| `P`     | Paste system clipboard before selections                              | `paste_clipboard_before`            |
-| `y`     | Join and yank selections to clipboard                                 | `yank_joined_to_clipboard`          |
-| `Y`     | Yank main selection to clipboard                                      | `yank_main_selection_to_clipboard`  |
-| `R`     | Replace selections by clipboard contents                              | `replace_selections_with_clipboard` |
-| `/`     | Global search in workspace folder                                     | `global_search`                     |
+| Key     | Description                                                             | Command                             |
+| -----   | -----------                                                             | -------                             |
+| `f`     | Open file picker                                                        | `file_picker`                       |
+| `b`     | Open buffer picker                                                      | `buffer_picker`                     |
+| `k`     | Show documentation for item under cursor in a [popup](#popup) (**LSP**) | `hover`                             |
+| `s`     | Open document symbol picker (**LSP**)                                   | `symbol_picker`                     |
+| `S`     | Open workspace symbol picker (**LSP**)                                  | `workspace_symbol_picker`           |
+| `r`     | Rename symbol (**LSP**)                                                 | `rename_symbol`                     |
+| `a`     | Apply code action  (**LSP**)                                            | `code_action`                       |
+| `'`     | Open last fuzzy picker                                                  | `last_picker`                       |
+| `w`     | Enter [window mode](#window-mode)                                       | N/A                                 |
+| `p`     | Paste system clipboard after selections                                 | `paste_clipboard_after`             |
+| `P`     | Paste system clipboard before selections                                | `paste_clipboard_before`            |
+| `y`     | Join and yank selections to clipboard                                   | `yank_joined_to_clipboard`          |
+| `Y`     | Yank main selection to clipboard                                        | `yank_main_selection_to_clipboard`  |
+| `R`     | Replace selections by clipboard contents                                | `replace_selections_with_clipboard` |
+| `/`     | Global search in workspace folder                                       | `global_search`                     |
 
 > TIP: Global search displays results in a fuzzy picker, use `space + '` to bring it back up after opening a file.
+
+##### Popup
+
+Displays documentation for item under cursor.
+
+| Key      | Description |
+| ----     | ----------- |
+| `Ctrl-u` | Scroll up   |
+| `Ctrl-d` | Scroll down |
  
 #### Unimpaired