diff --git a/compiler/options.nim b/compiler/options.nim
index 10fbab2275167..6471497951c3a 100644
--- a/compiler/options.nim
+++ b/compiler/options.nim
@@ -261,9 +261,7 @@ type
     implicitIncludes*: seq[string] # modules that are to be implicitly included
     docSeeSrcUrl*: string # if empty, no seeSrc will be generated. \
     # The string uses the formatting variables `path` and `line`.
-    docRoot*: AbsoluteDir
-      # `nim doc --docRoot:foo --project --outdir:docs foo/sub/main.nim`
-      # genrates: docs/sub/main.html
+    docRoot*: AbsoluteDir ## see nim --fullhelp for --docRoot
 
      # the used compiler
     cIncludes*: seq[AbsoluteDir]  # directories to search for included files
diff --git a/doc/advopt.txt b/doc/advopt.txt
index d53acc111d06d..64a25b9e5a23f 100644
--- a/doc/advopt.txt
+++ b/doc/advopt.txt
@@ -67,6 +67,8 @@ Advanced options:
   --clib:LIBNAME            link an additional C library
                             (you should omit platform-specific extensions)
   --project                 document the whole project (doc2)
+  --docRoot:path            nim doc --docRoot:foo --project --outdir:docs foo/sub/main.nim
+                            generates: docs/sub/main.html
   --docSeeSrcUrl:url        activate 'see source' for doc and doc2 commands
                             (see doc.item.seesrc in config/nimdoc.cfg)
   --docInternal             also generate documentation for non-exported symbols