diff --git a/docs/topics/stats.rst b/docs/topics/stats.rst
index 028fb009d..0cf4a72cc 100644
--- a/docs/topics/stats.rst
+++ b/docs/topics/stats.rst
@@ -94,27 +94,10 @@ default Stats Collector used is the :class:`MemoryStatsCollector`.
 MemoryStatsCollector
 --------------------
 
-.. class:: MemoryStatsCollector
-
-    A simple stats collector that keeps the stats of the last scraping run (for
-    each spider) in memory, after they're closed. The stats can be accessed
-    through the :attr:`spider_stats` attribute, which is a dict keyed by spider
-    name.
-
-    This is the default Stats Collector used in Scrapy.
-
-    .. attribute:: spider_stats
-
-       A dict of dicts (keyed by spider name) containing the stats of the last
-       scraping run for each spider.
+.. autoclass:: MemoryStatsCollector
+   :members:
 
 DummyStatsCollector
 -------------------
 
-.. class:: DummyStatsCollector
-
-    A Stats collector which does nothing but is very efficient (because it does
-    nothing). This stats collector can be set via the :setting:`STATS_CLASS`
-    setting, to disable stats collect in order to improve performance. However,
-    the performance penalty of stats collection is usually marginal compared to
-    other Scrapy workload like parsing pages.
+.. autoclass:: DummyStatsCollector
diff --git a/scrapy/statscollectors.py b/scrapy/statscollectors.py
index 1f9894519..3143fed63 100644
--- a/scrapy/statscollectors.py
+++ b/scrapy/statscollectors.py
@@ -101,9 +101,21 @@ class StatsCollector:
 
 
 class MemoryStatsCollector(StatsCollector):
+    """A simple stats collector that keeps the stats of the last scraping run
+    (for each spider) in memory, after they're closed. The stats can be
+    accessed through the :attr:`spider_stats` attribute, which is a dict keyed
+    by spider name.
+
+    This is the default stats collector used in Scrapy.
+    """
+
+    spider_stats: dict[str, StatsT]
+    """A dict of dicts (keyed by spider name) containing the stats of the last
+    scraping run for each spider."""
+
     def __init__(self, crawler: Crawler):
         super().__init__(crawler)
-        self.spider_stats: dict[str, StatsT] = {}
+        self.spider_stats = {}
 
     def _persist_stats(self, stats: StatsT) -> None:
         if self._crawler.spider:
@@ -111,6 +123,13 @@ class MemoryStatsCollector(StatsCollector):
 
 
 class DummyStatsCollector(StatsCollector):
+    """A stats collector which does nothing but is very efficient (because it
+    does nothing). This stats collector can be set via the
+    :setting:`STATS_CLASS` setting, to disable stats collection in order to
+    improve performance. However, the performance penalty of stats collection
+    is usually marginal compared to other Scrapy workload like parsing pages.
+    """
+
     def get_value(
         self, key: str, default: Any = None, spider: Spider | None = None
     ) -> Any: