diff --git a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
index 21727c7ec2be..83d60b398d8a 100644
--- a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
+++ b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
@@ -2459,7 +2459,7 @@ object Parsers {
       else Nil
 
     /** Enumerator  ::=  Generator
-     *                |  Guard
+     *                |  Guard {Guard}
      *                |  Pattern1 `=' Expr
      */
     def enumerator(): Tree =
diff --git a/docs/docs/internals/syntax.md b/docs/docs/internals/syntax.md
index 670d46ff0568..74b5fc274241 100644
--- a/docs/docs/internals/syntax.md
+++ b/docs/docs/internals/syntax.md
@@ -269,9 +269,9 @@ ForExpr           ::=  ‘for’ (‘(’ Enumerators ‘)’ | ‘{’ Enumerat
                     |  ‘for’ Enumerators (‘do’ Expr | ‘yield’ Expr)             ForDo(enums, expr)
 Enumerators       ::=  Generator {semi Enumerator | Guard}
 Enumerator        ::=  Generator
-                    |  Guard
+                    |  Guard {Guard}
                     |  Pattern1 ‘=’ Expr                                        GenAlias(pat, expr)
-Generator         ::=  [‘case’] Pattern1 ‘<-’ Expr                                       GenFrom(pat, expr)
+Generator         ::=  [‘case’] Pattern1 ‘<-’ Expr                              GenFrom(pat, expr)
 Guard             ::=  ‘if’ PostfixExpr
 
 CaseClauses       ::=  CaseClause { CaseClause }                                Match(EmptyTree, cases)
diff --git a/docs/docs/reference/syntax.md b/docs/docs/reference/syntax.md
index b2de66272ddf..ff87b3d61d57 100644
--- a/docs/docs/reference/syntax.md
+++ b/docs/docs/reference/syntax.md
@@ -264,7 +264,7 @@ ForExpr           ::=  ‘for’ (‘(’ Enumerators ‘)’ | ‘{’ Enumerat
                     |  ‘for’ Enumerators (‘do’ Expr | ‘yield’ Expr)
 Enumerators       ::=  Generator {semi Enumerator | Guard}
 Enumerator        ::=  Generator
-                    |  Guard
+                    |  Guard {Guard}
                     |  Pattern1 ‘=’ Expr
 Generator         ::=  [‘case’] Pattern1 ‘<-’ Expr
 Guard             ::=  ‘if’ PostfixExpr