diff --git a/compiler/parser.nim b/compiler/parser.nim
index 7b6ef8ee56..0f52750c94 100644
--- a/compiler/parser.nim
+++ b/compiler/parser.nim
@@ -981,6 +981,7 @@ proc parseSymbolList(p: var TParser, result: PNode, allowNil = false) =
 
 proc parseTypeDescKAux(p: var TParser, kind: TNodeKind,
                        mode: TPrimaryMode): PNode =
+  #| distinct = 'distinct' optInd typeDesc
   result = newNodeP(kind, p)
   getTok(p)
   optInd(p, result)
diff --git a/doc/grammar.txt b/doc/grammar.txt
index 61557b68c4..fe53418405 100644
--- a/doc/grammar.txt
+++ b/doc/grammar.txt
@@ -82,6 +82,7 @@ paramListColon = paramList? (':' optInd typeDesc)?
 doBlock = 'do' paramListArrow pragmas? colcom stmt
 doBlocks = doBlock ^* IND{=}
 procExpr = 'proc' paramListColon pragmas? ('=' COMMENT? stmt)?
+distinct = 'distinct' optInd typeDesc
 expr = (ifExpr
       | whenExpr
       | caseExpr