diff --git a/hornbeam_grammar/src/hornbeam.pest b/hornbeam_grammar/src/hornbeam.pest
index 3cd06ec..cb8ac5f 100644
--- a/hornbeam_grammar/src/hornbeam.pest
+++ b/hornbeam_grammar/src/hornbeam.pest
@@ -198,7 +198,9 @@ bracketedTerm = _{ "(" ~ Expr ~ ")" }
 
 
 IntLiteral =  @{ (ASCII_NONZERO_DIGIT ~ ASCII_DIGIT+ | ASCII_DIGIT) }
-Identifier = { (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }
+// `-` is important in identifiers for `kebab-case` HTML element attributes
+// We could consider splitting this out into its own kind of identifier but let's not bother now.
+Identifier = { (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_" | "-")* }
 commaSeparatedExprs = _{ wsnl* ~ (Expr ~ wsnl* ~ ("," ~ wsnl* ~ Expr ~ wsnl*)* ~ ("," ~ wsnl*)?)? }
 FunctionCall = { Identifier ~ "(" ~ commaSeparatedExprs ~ ")" }
 Variable = { "$" ~ Identifier }