Allow and ignore underscores in numbers

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/literal.md b/spec/literal.md
index edf91b83..ab644601 100644
--- a/spec/literal.md
+++ b/spec/literal.md
@@ -6,7 +6,7 @@ A *literal* is a single [token](token.md) that indicates a fixed character, numb
 
 Two types of literal deal with text. As the source code is considered to be a sequence of unicode code points ("characters"), and these code points are also used for BQN's character [data type](types.md), the representation of a text literal is very similar to its value. In a text literal, the newline character is always represented using the ASCII line feed character, code point 10. A *character literal* is enclosed with single quotes `'` and its value is identical to the single character between them. A *string literal* is enclosed in double quotes `"`, and any double quotes between them must come in pairs, as a lone double quote marks the end of the literal. The value of a string literal is a rank-1 array whose elements are the characters in between the enclosing quotes, after replacing each pair of double quotes with only one such quote. The *null literal* is the token `@` and represents the null character, code point 0.
 
-The format of a *numeric literal* is more complicated. From the [tokenization rules](token.md), a numeric literal consists of a numeric character (one of `¯∞π.0123456789`) followed by any number of numeric or alphabetic characters. Some numeric literals are *valid* and indicate a number, while others are invalid and cause an error. The grammar for valid numbers is given below in a [BNF](https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form) variant. Only four alphabetic characters are allowed: "i", which separates the real and imaginary components of a complex number, "e", which functions as in scientific notation, and the uppercase versions of these letters.
+The format of a *numeric literal* is more complicated. From the [tokenization rules](token.md), a numeric literal consists of a numeric character (one of `¯∞π.0123456789`) followed by any number of numeric or alphabetic characters. Some numeric literals are *valid* and indicate a number, while others are invalid and cause an error. The grammar for valid numbers is given below in a [BNF](https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form) variant. Only four alphabetic characters are allowed: "i", which separates the real and imaginary components of a complex number, "e", which functions as in scientific notation, and the uppercase versions of these letters. Not included in this grammar are underscores—they can be placed anywhere in a number, including after the last non-underscore character, and are ignored entirely.
 
     number    = component ( ( "i" | "I" ) component )?
     component = "¯"? ( "∞" | mantissa ( ( "e" | "E" ) exponent )? )