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-rw-r--r--doc/src/sgml/storage.sgml13
1 files changed, 7 insertions, 6 deletions
diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index 8ef2ac80106..cbdad0c3fb5 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -590,12 +590,13 @@ tuple would otherwise be too big.
<indexterm><primary>FSM</primary><see>Free Space Map</see></indexterm>
<para>
-Each heap and index relation, except for hash indexes, has a Free Space Map
-(FSM) to keep track of available space in the relation. It's stored
-alongside the main relation data in a separate relation fork, named after the
-filenode number of the relation, plus a <literal>_fsm</literal> suffix. For example,
-if the filenode of a relation is 12345, the FSM is stored in a file called
-<filename>12345_fsm</filename>, in the same directory as the main relation file.
+Each heap relation, unless it is very small, and each index relation, except
+for hash indexes, has a Free Space Map (FSM) to keep track of available
+space in the relation. It's stored alongside the main relation data in a
+separate relation fork, named after the filenode number of the relation, plus
+a <literal>_fsm</literal> suffix. For example, if the filenode of a relation
+is 12345, the FSM is stored in a file called <filename>12345_fsm</filename>,
+in the same directory as the main relation file.
</para>
<para>