1 files changed, 1 insertions, 1 deletions
diff --git a/README.md b/README.md
index c93f48c..f3e7f61 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ The simplest subexes are literals. These just copy directly from the input to th
 | Syntax | Description |
 | --- | --- |
 | `.` | Copy across any single atom unchanged |
-| `,` | Copy across any single value unchanged (will copy a whole string) |
+| `,` | Copy across any single JSON value (not `{`, `}`, `[` or `]` tokens) unchanged (will copy a whole string). Equivalent to `` `null`|?|%|# `` |
 | `?` | Copy across any single boolean atom |
 | `%` | Copy across any single number |
 | `_` | Copy across a single unicode codepoint inside a string |