Index: doc/next-tutorial/next-tutorial.txt
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diff -u -rb5c493afe905b1bafc17697ed3ce01d1662c77b3 -r67639f37e908458f0c4016135f8d7771c7dde465
--- doc/next-tutorial/next-tutorial.txt	(.../next-tutorial.txt)	(revision b5c493afe905b1bafc17697ed3ce01d1662c77b3)
+++ doc/next-tutorial/next-tutorial.txt	(.../next-tutorial.txt)	(revision 67639f37e908458f0c4016135f8d7771c7dde465)
@@ -464,7 +464,7 @@
 SafeStack create s3
 --------------------------------------------------
 
-The difference of a per-class mixin and an per-object mixin is that
+The difference of a per-class mixin and a per-object mixin is that
 the per-class mixin is applicable to all instances of the
 class. Therefore, we call these mixins also sometimes instance mixins.
 In our example in <<xmp-class-safestack,{xmp-class-safestack}>>,