diff --git a/specification/trace/sdk.md b/specification/trace/sdk.md
index 6a315d11b6f..1b46ae1b958 100644
--- a/specification/trace/sdk.md
+++ b/specification/trace/sdk.md
@@ -287,17 +287,17 @@ invocations. The span processors are invoked only when
 [`IsRecording`](api.md#isrecording) is true.
 
 Built-in span processors are responsible for batching and conversion of spans to
-exportable representation and passing batches to exporters.
+exportable representation and passing batches to exporters or alternatives to
+exporters such as [z-pages](../../experimental/trace/zpages.md).
 
 Span processors can be registered directly on SDK `TracerProvider` and they are
 invoked in the same order as they were registered.
 
-Each processor registered on `TracerProvider` is a start of pipeline that consist
-of span processor and optional exporter. SDK MUST allow to end each pipeline with
-individual exporter.
+Each processor registered on `TracerProvider` is a start of a pipeline that consists
+of one or more span processors and, optionally, one or more exporters. The SDK MUST
+allow ending each pipeline with an individual exporter.
 
-SDK MUST allow users to implement and configure custom processors and decorate
-built-in processors for advanced scenarios such as tagging or filtering.
+The SDK MUST allow users to implement and configure custom processors.
 
 The following diagram shows `SpanProcessor`'s relationship to other components
 in the SDK:
@@ -391,13 +391,19 @@ make the flush timeout configurable.
 
 The standard OpenTelemetry SDK MUST implement both simple and batch processors,
 as described below. Other common processing scenarios should be first considered
-for implementation out-of-process in [OpenTelemetry Collector](../overview.md#collector)
+for implementation out-of-process in an [OpenTelemetry Collector](../overview.md#collector).
 
 #### Simple processor
 
 This is an implementation of `SpanProcessor` which passes finished spans
-and passes the export-friendly span data representation to the configured
-`SpanExporter`, as soon as they are finished.
+and the export-friendly span data representation to the configured
+`SpanExporter` as soon as they are finished.
+
+The simple processor must not be used lightly in production. It runs on application thread and may
+degrade performance. It may be appropriate for production use in scenarios where creating
+multiple threads is not desirable (since batching span processors will typically be threaded
+in order to pass spans on to exporters in the background) as well as scenarios where different
+custom attributes should be added to individual spans based on code scopes.
 
 **Configurable parameters:**
 
@@ -405,21 +411,23 @@ and passes the export-friendly span data representation to the configured
 
 #### Batching processor
 
-This is an implementation of the `SpanProcessor` which create batches of finished
-spans and passes the export-friendly span data representations to the
-configured `SpanExporter`.
+This is an implementation of `SpanProcessor` which collects finished spans into batches
+and passes the export-friendly span data representations to the associated `SpanExporter`.
+
+Typically, the batching processor will be more suitable for production environments
+than the simple processor.
 
 **Configurable parameters:**
 
 * `exporter` - the exporter where the spans are pushed.
-* `maxQueueSize` - the maximum queue size. After the size is reached spans are
-  dropped. The default value is `2048`.
+* `maxQueueSize` - the maximum queue size. After this limit is reached, spans are
+  skipped by this BatchSpanProcessor. The default value is `2048`.
 * `scheduledDelayMillis` - the delay interval in milliseconds between two
   consecutive exports. The default value is `5000`.
 * `exportTimeoutMillis` - how long the export can run before it is cancelled.
   The default value is `30000`.
 * `maxExportBatchSize` - the maximum batch size of every export. It must be
-  smaller or equal to `maxQueueSize`. The default value is `512`.
+  smaller than or equal to `maxQueueSize`. The default value is `512`.
 
 ## Span Exporter