enumerations.md: fix pluralisation
diff --git a/src/items/enumerations.md b/src/items/enumerations.md
index bc79d2d..89dd073 100644
--- a/src/items/enumerations.md
+++ b/src/items/enumerations.md
@@ -59,7 +59,7 @@
 called an enum variant.
 
 r[items.enum.fieldless]
-An enum where no constructors contain fields are called a
+An enum where no constructors contain fields is called a
 *<span id="field-less-enum">field-less enum</span>*. For example, this is a fieldless enum:
 
 ```rust