diff --git a/doc/org-manual.org b/doc/org-manual.org
index 53ed01ff8..21e13ded1 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -12558,7 +12558,7 @@ Inclusions may specify a file-link to extract an object matched by
 ranges for =:lines= keyword are relative to the requested element.
 Therefore,
 
-: #+INCLUDE: "./paper.org::*conclusion" :lines 1-20
+: #+INCLUDE: "./paper.org::*conclusion" :lines "1-20"
 
 #+texinfo: @noindent
 includes the first 20 lines of the headline named =conclusion=.