diff --git a/compiler/parser.nim b/compiler/parser.nim
index 4974abcc33..1ae7646cdd 100644
--- a/compiler/parser.nim
+++ b/compiler/parser.nim
@@ -17,6 +17,8 @@
 
 # In fact the grammar is generated from this file:
 when isMainModule:
+  # Leave a note in grammar.txt that it is generated:
+  #| # This file is generated by compiler/parser.nim.
   import pegs
   var outp = open("doc/grammar.txt", fmWrite)
   for line in lines("compiler/parser.nim"):
@@ -1675,7 +1677,7 @@ proc parseSection(p: var TParser, kind: TNodeKind,
     parMessage(p, errIdentifierExpected, p.tok)
 
 proc parseConstant(p: var TParser): PNode =
-  #| constant = identWithPragma (colon typedesc)? '=' optInd expr indAndComment
+  #| constant = identWithPragma (colon typeDesc)? '=' optInd expr indAndComment
   result = newNodeP(nkConstDef, p)
   addSon(result, identWithPragma(p))
   if p.tok.tokType == tkColon:
diff --git a/doc/grammar.txt b/doc/grammar.txt
index eae3694a09..f25b079f40 100644
--- a/doc/grammar.txt
+++ b/doc/grammar.txt
@@ -1,3 +1,4 @@
+# This file is generated by compiler/parser.nim.
 module = stmt ^* (';' / IND{=})
 comma = ',' COMMENT?
 semicolon = ';' COMMENT?
@@ -155,7 +156,7 @@ routine = optInd identVis pattern? genericParamList?
   paramListColon pragma? ('=' COMMENT? stmt)? indAndComment
 commentStmt = COMMENT
 section(p) = COMMENT? p / (IND{>} (p / COMMENT)^+IND{=} DED)
-constant = identWithPragma (colon typedesc)? '=' optInd expr indAndComment
+constant = identWithPragma (colon typeDesc)? '=' optInd expr indAndComment
 enum = 'enum' optInd (symbol optInd ('=' optInd expr COMMENT?)? comma?)+
 objectWhen = 'when' expr colcom objectPart COMMENT?
             ('elif' expr colcom objectPart COMMENT?)*