updated readme

docs/readers.md

@@ -296,6 +296,8 @@ for await (const block of BulkParser.read(rawChunks)) {
 
 Every [LogReader](#class-logreader) needs a source from which to read logs. The most common source is simply the filesystem directory that the logs were written to. LogDirectorySource does exactly that; it allows you to read log files from a directory on the filesystem. This class is not available in the browser.
 
+> Note that log files generated by distinct server clusters running concurrently cannot be combined into a single log directory. If you have multiple server clusters running concurrently, their logs can only be read separately and then combined manually.
+
 ### new LogDirectorySource(dirname[, options])
 
 - `dirname` [<string>][string] The path of the log directory.

docs/writers.md

@@ -32,6 +32,8 @@
 
 This class faciliates log rotation. It should be used within the master process of your [server cluster](https://nodejs.org/api/cluster.html). It keeps track of log files within a directory, detects when the log files get too big or too old, and deletes the oldest files when necessary. It also provides the filenames that your loggers should write to.
 
+> Note that two (or more) server clusters must not write to the same log directory concurrently. Attempting to do so will likely lead to corrupted logs.
+
 LogManager is a subclass of [EventEmitter][EventEmitter].
 
 ### new LogManager(dirname[, options])