diff --git a/book/src/keymap.md b/book/src/keymap.md
index 0550e57f3..8864ab696 100644
--- a/book/src/keymap.md
+++ b/book/src/keymap.md
@@ -130,7 +130,7 @@
 | `X`                   | Extend selection to line bounds (line-wise selection)             | `extend_to_line_bounds`              |
 | `Alt-x`               | Shrink selection to line bounds (line-wise selection)             | `shrink_to_line_bounds`              |
 | `J`                   | Join lines inside selection                                       | `join_selections`                    |
-| `Alt-J`               | Join lines inside selection and select space                      | `join_selections_space`              |
+| `Alt-J`               | Join lines inside selection and select the inserted space         | `join_selections_space`              |
 | `K`                   | Keep selections matching the regex                                | `keep_selections`                    |
 | `Alt-K`               | Remove selections matching the regex                              | `remove_selections`                  |
 | `Ctrl-c`              | Comment/uncomment the selections                                  | `toggle_comments`                    |