DOCS-859: correction

Author: Sam Kleinman

source/reference/limits.txt

@@ -63,8 +63,9 @@ Indexes
 .. _limit-index-size:
 .. limit:: Index Size
 
-   Indexed items can be *no larger* than 1024 bytes. This value is the
-   indexed content (i.e. the field value, or compound field value.)
+   Indexed items can be *no larger* than 1024 bytes. This includes the
+   name space, field name or names, and the value or values of the
+   indexed fields.
 
 .. _limit-number-of-indexes-per-collection:
 .. limit:: Number of Indexes per Collection