Finished the "Extending APScheduler" documentation

3 files changed, 4 insertions, 2 deletions

diff --git a/apscheduler/executors/base.py b/apscheduler/executors/base.py
index 65a4a3f..0bb173b 100644
--- a/apscheduler/executors/base.py
+++ b/apscheduler/executors/base.py
@@ -18,7 +18,7 @@ class MaxInstancesReachedError(Exception):
 
 
 class BaseExecutor(six.with_metaclass(ABCMeta, object)):
-    """Base class of all executors."""
+    """Abstract base class that defines the interface that every executor must implement."""
 
     _scheduler = None
     _lock = None
diff --git a/apscheduler/jobstores/base.py b/apscheduler/jobstores/base.py
index 30a9997..7ac44c3 100644
--- a/apscheduler/jobstores/base.py
+++ b/apscheduler/jobstores/base.py
@@ -28,7 +28,7 @@ class TransientJobError(ValueError):
 
 
 class BaseJobStore(six.with_metaclass(ABCMeta)):
-    """Abstract base class that provides the interface needed by all job stores."""
+    """Abstract base class that defines the interface that every job store must implement."""
 
     _scheduler = None
     _alias = None
diff --git a/apscheduler/triggers/base.py b/apscheduler/triggers/base.py
index ec8118d..3520d31 100644
--- a/apscheduler/triggers/base.py
+++ b/apscheduler/triggers/base.py
@@ -4,6 +4,8 @@ import six
 
 
 class BaseTrigger(six.with_metaclass(ABCMeta)):
+    """Abstract base class that defines the interface that every trigger must implement."""
+
     @abstractmethod
     def get_next_fire_time(self, previous_fire_time, now):
         """