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diff --git a/book/src/usage.md b/book/src/usage.md
index 3c48e306..e392e5e6 100644
--- a/book/src/usage.md
+++ b/book/src/usage.md
@@ -37,19 +37,35 @@ If a register is selected before invoking a change or delete command, the select
- `"hc` - Store the selection in register `h` and then change it (delete and enter insert mode).
- `"md` - Store the selection in register `m` and delete it.
-### Special registers
+### Default registers
+
+Commands that use registers, like yank (`y`), use a default register if none is specified.
+These registers are used as defaults:
| Register character | Contains |
| --- | --- |
| `/` | Last search |
| `:` | Last executed command |
| `"` | Last yanked text |
-| `_` | Black hole |
+| `@` | Last recorded macro |
-The system clipboard is not directly supported by a special register. Instead, special commands and keybindings are provided. Refer to the
-[key map](keymap.md#space-mode) for more details.
+### Special registers
-The black hole register is a no-op register, meaning that no data will be read or written to it.
+Some registers have special behavior when read from and written to.
+
+| Register character | When read | When written |
+| --- | --- | --- |
+| `_` | No values are returned | All values are discarded |
+| `#` | Selection indices (first selection is `1`, second is `2`, etc.) | This register is not writable |
+| `.` | Contents of the current selections | This register is not writable |
+| `%` | Name of the current file | This register is not writable |
+| `*` | Reads from the system clipboard | Joins and yanks to the system clipboard |
+| `+` | Reads from the primary clipboard | Joins and yanks to the primary clipboard |
+
+When yanking multiple selections to the clipboard registers, the selections
+are joined with newlines. Pasting from these registers will paste multiple
+selections if the clipboard was last yanked to by the Helix session. Otherwise
+the clipboard contents are pasted as one selection.
## Surround