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diff --git a/doc/development/polymorphic_associations.md b/doc/development/polymorphic_associations.md
index f341255a7e1..bbeaab40a90 100644
--- a/doc/development/polymorphic_associations.md
+++ b/doc/development/polymorphic_associations.md
@@ -146,7 +146,7 @@ filter rows using the `IS NULL` condition.
To summarize: using separate tables allows us to use foreign keys effectively,
create indexes only where necessary, conserve space, query data more
-efficiently, and scale these tables more easily (e.g. by storing them on
+efficiently, and scale these tables more easily (for example, by storing them on
separate disks). A nice side effect of this is that code can also become easier,
as a single model isn't responsible for handling different kinds of
data.