Updated Filer Metadata Events (markdown)

Filer-Metadata-Events.md

@@ -1,7 +1,7 @@
-On filer, there is a `/topics/.system/log` folder, it stores all events from filer metadata change events.
+On filer, there is a `/topics/.system/log` folder, it stores all filer metadata change events.
 
 ## Metadata Event Format
-The events are organized by timestamp, `yyyy-MM-dd/hh-mm.segment`.
+The events are stored in files organized by timestamp, `yyyy-MM-dd/hh-mm.segment`.
 
 The events are encoded by protobuf, defined in https://github.com/chrislusf/seaweedfs/blob/master/weed/pb/filer.proto . The related sections are:
 ```
@@ -34,7 +34,7 @@ message LogEntry {
 
 ```
 
-The ondisk file is a repeated of the following bytes:
+The ondisk file is a repeated bytes of the following format:
   1. 4 bytes of `LogEntry` size
   2. serialized `LogEntry`
 
@@ -68,7 +68,9 @@ message SubscribeMetadataResponse {
 
 This is similar to `inotify` in normal file system, but actually much more powerful. Usually `inotify` can only monitor one directory and its direct children, but SeaweedFS metadata subscription can monitor one directory and all its sub-directories and files.
 
-This could be useful to build powerful event driven data processing pipelines. Please let me know if you have some great ideas or accomplishment!
+This API also allows you to read from any point of time and replay all metadata events.
+
+This API could be useful to build powerful event driven data processing pipelines. Please let me know if you have some great ideas or accomplishment!
 
 ### What kind of events it contains?