diff --git a/src/backend/utils/activity/pgstat.c b/src/backend/utils/activity/pgstat.c
index bfbfe53deb..504f952c0e 100644
--- a/src/backend/utils/activity/pgstat.c
+++ b/src/backend/utils/activity/pgstat.c
@@ -4,9 +4,9 @@
  *
  *
  * PgStat_KindInfo describes the different types of statistics handled. Some
- * kinds of statistics are collected for fixed number of objects
- * (e.g. checkpointer statistics). Other kinds are statistics are collected
- * for variable-numbered objects (e.g. relations).
+ * kinds of statistics are collected for a fixed number of objects
+ * (e.g., checkpointer statistics). Other kinds of statistics are collected
+ * for a varying number of objects (e.g., relations).
  *
  * Fixed-numbered stats are stored in plain (non-dynamic) shared memory.
  *
@@ -19,19 +19,21 @@
  *
  * All variable-numbered stats are addressed by PgStat_HashKey while running.
  * It is not possible to have statistics for an object that cannot be
- * addressed that way at runtime. A wider identifier can be used when
+ * addressed that way at runtime. A alternate identifier can be used when
  * serializing to disk (used for replication slot stats).
  *
  * Each stats entry in shared memory is protected by a dedicated lwlock.
  *
  * To avoid contention on the shared hashtable, each backend has a
- * backend-local hashtable (pgStatEntryRefHash) in front of the shared
- * hashtable, containing references (PgStat_EntryRef) to shared hashtable
- * entries. The shared hashtable only needs to be accessed when no prior
- * reference to the shared hashtable exists. Besides pointing to the the
- * shared hashtable entry (PgStatShared_HashEntry) PgStat_EntryRef also
- * contains a pointer to the the shared statistics data, as a process-local
- * address, to reduce access costs.
+ * read-only, backend-local, transaction-scoped, hashtable (pgStatEntryRefHash)
+ * in front of the shared hashtable, containing references (PgStat_EntryRef)
+ * to shared hashtable entries. The shared hashtable thus only needs to be
+ * accessed when the PgStat_HashKey is not present in the backend-local hashtable,
+ * or if stats_fetch_consistency = 'none'.
+ *
+ * Besides pointing to the shared hashtable entry (PgStatShared_HashEntry),
+ * PgStat_EntryRef also contains a pointer to the the shared statistics data,
+ * as a process-local address, to reduce access costs.
  *
  * The names for structs stored in shared memory are prefixed with
  * PgStatShared instead of PgStat.
@@ -53,15 +55,16 @@
  * entry in pgstat_kind_infos, see PgStat_KindInfo for details.
  *
  *
- * To keep things manageable stats handling is split across several
+ * To keep things manageable, stats handling is split across several
  * files. Infrastructure pieces are in:
- * - pgstat.c - this file, to tie it all together
+ * - pgstat.c - this file, which ties everything together
  * - pgstat_shmem.c - nearly everything dealing with shared memory, including
  *   the maintenance of hashtable entries
  * - pgstat_xact.c - transactional integration, including the transactional
- *   creation / dropping of stats entries
+ *   creation and dropping of stats entries
  *
- * Each statistics kind is handled in a dedicated file:
+ * Each statistics kind is handled in a dedicated file, though their structs
+ * are defined here for lack of better ideas.
  * - pgstat_archiver.c
  * - pgstat_bgwriter.c
  * - pgstat_checkpointer.c