diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3bc032..cd30307 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 * Single line comments (`//`) can now be immediately followed by a newline.
 * All literal whitespace following a `\` in a string is now discarded.
 * Vertical tabs (`U+000B`) are now considered to be whitespace.
+* Identifiers can't start with `r#`, so they're easy to distinguish from raw strings. (They already similarly can't start with a digit, or a sign+digit, so they're easy to distinguish from numbers.)
 
 ### KQL
 
diff --git a/SPEC.md b/SPEC.md
index 55a4d1a..cbd90c7 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -482,7 +482,10 @@ node-space := ws* escline ws* | ws+
 node-terminator := single-line-comment | newline | ';' | eof
 
 identifier := string | bare-identifier
-bare-identifier := ((identifier-char - digit - sign) identifier-char* | sign ((identifier-char - digit) identifier-char*)?) - keyword
+bare-identifier := (unambiguous-ident | numberish-ident | stringish-ident) - keyword
+unambiguous-ident := (identifier-char - digit - sign - "r") identifier-char*
+numberish-ident := sign ((identifier-char - digit) identifier-char*)?
+stringish-ident := "r" ((identifier-char - "#") identifier-char*)?
 identifier-char := unicode - linespace - [\/(){}<>;[]=,"]
 keyword := boolean | 'null'
 prop := identifier '=' value