diff --git a/01.md b/01.md
index f5673b38..0840f2e6 100644
--- a/01.md
+++ b/01.md
@@ -46,11 +46,13 @@ To obtain the `event.id`, we `sha256` the serialized event. The serialization is
 To prevent implementation differences from creating a different event ID for the same event, the following rules MUST be followed while serializing:
 - No whitespace, line breaks or other unnecessary formatting should be included in the output JSON.
 - No characters except the following should be escaped, and instead should be included verbatim:
-  - The line break, `0x0A`, as `\n`
+  - A line break, `0x0A`, as `\n`
   - A double quote, `0x22`, as `\"`
   - A backslash, `0x5C`, as `\\`
   - A carriage return, `0x0D`, as `\r`
   - A tab character, `0x09`, as `\t`
+  - A backspace, `0x08`, as `\b`
+  - A form feed, `0x0C`, as `\f`
 - UTF-8 should be used for encoding.
 
 ## Communication between clients and relays