diff --git a/osf/metrics/reporters/public_item_usage.py b/osf/metrics/reporters/public_item_usage.py
index 740d7308f88..e61ae1933de 100644
--- a/osf/metrics/reporters/public_item_usage.py
+++ b/osf/metrics/reporters/public_item_usage.py
@@ -18,6 +18,8 @@
 
 _CHUNK_SIZE = 500
 
+_MAX_CARDINALITY_PRECISION = 40000  # https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html#_precision_control
+
 
 class _SkipItem(Exception):
     pass
@@ -142,7 +144,7 @@ def _exact_item_search(self, yearmonth) -> edsl.Search:
             'agg_session_count',
             'cardinality',
             field='session_id',
-            precision_threshold=40000,  # maximum precision
+            precision_threshold=_MAX_CARDINALITY_PRECISION,
         )
         return _search
 
@@ -185,7 +187,7 @@ def _get_view_session_count(self, yearmonth, osfid: str):
             'agg_session_count',
             'cardinality',
             field='session_id',
-            precision_threshold=40000,  # maximum precision
+            precision_threshold=_MAX_CARDINALITY_PRECISION,
         )
         _response = _search.execute()
         return _response.aggregations.agg_session_count.value
@@ -243,7 +245,7 @@ def _iter_composite_buckets(search: edsl.Search, composite_agg_name: str):
     updates the search in-place for subsequent pages
     '''
     while True:
-        _page_response = search.execute(ignore_cache=True)
+        _page_response = search.execute(ignore_cache=True)  # reused search object has the previous page cached
         try:
             _agg_result = _page_response.aggregations[composite_agg_name]
         except KeyError:
diff --git a/osf/metrics/reports.py b/osf/metrics/reports.py
index bb0553f7f3b..c9c2846adfc 100644
--- a/osf/metrics/reports.py
+++ b/osf/metrics/reports.py
@@ -290,17 +290,18 @@ class InstitutionMonthlySummaryReport(MonthlyReport):
 class PublicItemUsageReport(MonthlyReport):
     UNIQUE_TOGETHER_FIELDS = ('report_yearmonth', 'item_osfid')
 
-    # where noted, fields correspond to defined terms from COUNTER
+    # where noted, fields are meant to correspond to defined terms from COUNTER
     # https://cop5.projectcounter.org/en/5.1/appendices/a-glossary-of-terms.html
-    item_osfid = metrics.Keyword()                    # counter:Item
+    # https://coprd.countermetrics.org/en/1.0.1/appendices/a-glossary.html
+    item_osfid = metrics.Keyword()                    # counter:Item (or Dataset)
     item_type = metrics.Keyword(multi=True)           # counter:Data-Type
     provider_id = metrics.Keyword(multi=True)         # counter:Database(?)
     platform_iri = metrics.Keyword(multi=True)        # counter:Platform
 
     # view counts include views on components or files contained by this item
-    view_count = metrics.Long()                       # counter:Total_Item_Investigations
-    view_session_count = metrics.Long()               # counter:Unique_Item_Investigations
+    view_count = metrics.Long()                       # counter:Total Investigations
+    view_session_count = metrics.Long()               # counter:Unique Investigations
 
     # download counts of this item only (not including contained components or files)
-    download_count = metrics.Long()                   # counter:Total_Item_Requests
-    download_session_count = metrics.Long()           # counter:Unique_Item_Requests
+    download_count = metrics.Long()                   # counter:Total Requests
+    download_session_count = metrics.Long()           # counter:Unique Requests