diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44d95302..1e3c4077 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 * Allow trailing comma in inline tables.
 * Clarify where and how dotted keys define tables.
 * Add new `\e` shorthand for the escape character.
+* Add \x00 notation to basic strings.
 
 ## 1.0.0 / 2021-01-11
 
diff --git a/toml.abnf b/toml.abnf
index 62771983..3d926ee7 100644
--- a/toml.abnf
+++ b/toml.abnf
@@ -82,8 +82,9 @@ escape-seq-char =/ %x66         ; f    form feed       U+000C
 escape-seq-char =/ %x6E         ; n    line feed       U+000A
 escape-seq-char =/ %x72         ; r    carriage return U+000D
 escape-seq-char =/ %x74         ; t    tab             U+0009
-escape-seq-char =/ %x75 4HEXDIG ; uXXXX                U+XXXX
-escape-seq-char =/ %x55 8HEXDIG ; UXXXXXXXX            U+XXXXXXXX
+escape-seq-char =/ %x78 2HEXDIG ; xHH                  U+00HH
+escape-seq-char =/ %x75 4HEXDIG ; uHHHH                U+HHHH
+escape-seq-char =/ %x55 8HEXDIG ; UHHHHHHHH            U+HHHHHHHH
 
 ;; Multiline Basic String
 
diff --git a/toml.md b/toml.md
index 7a0b0d73..58232cd9 100644
--- a/toml.md
+++ b/toml.md
@@ -267,7 +267,7 @@ the control characters other than tab (U+0000 to U+0008, U+000A to U+001F,
 U+007F).
 
 ```toml
-str = "I'm a string. \"You can quote me\". Name\tJos\u00E9\nLocation\tSF."
+str = "I'm a string. \"You can quote me\". Name\tJos\xE9\nLocation\tSF."
 ```
 
 For convenience, some popular characters have a compact escape sequence.
@@ -281,12 +281,13 @@ For convenience, some popular characters have a compact escape sequence.
 \e         - escape          (U+001B)
 \"         - quote           (U+0022)
 \\         - backslash       (U+005C)
-\uXXXX     - unicode         (U+XXXX)
-\UXXXXXXXX - unicode         (U+XXXXXXXX)
+\xHH       - unicode         (U+00HH)
+\uHHHH     - unicode         (U+HHHH)
+\UHHHHHHHH - unicode         (U+HHHHHHHH)
 ```
 
-Any Unicode character may be escaped with the `\uXXXX` or `\UXXXXXXXX` forms.
-The escape codes must be valid Unicode [scalar
+Any Unicode character may be escaped with the `\xHH`, `\uHHHH`, or `\UHHHHHHHH`
+forms. The escape codes must be valid Unicode [scalar
 values](https://unicode.org/glossary/#unicode_scalar_value).
 
 All other escape sequences not listed above are reserved; if they are used, TOML