diff --git a/MANUAL.txt b/MANUAL.txt
index 9ac9faadd..1172929a8 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -1446,7 +1446,7 @@ self-contained: false
 # note that structured variables may be specified:
 variables:
   documentclass: book
-  classoptions:
+  classoption:
     - twosides
     - draft