Update README.md

README.md

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 Since the Raft log is the authoritative store for all data, and it is stored on disk by each node, an in-memory database can be fully recreated on start-up from the information stored in the Raft log. Using an in-memory database does not put your data at risk.
 
 ## Limitations
- * In-memory databases are currently limited to 2GiB (2147483648 bytes) in size. Future releases may support larger in-memory databases.
+ * In-memory databases are currently limited to 2GiB (2147483648 bytes) in size. You can learn more about possible ways to get around this limit, in the [documentation](https://github.com/rqlite/rqlite/blob/master/DOC/PERFORMANCE.md#in-memory-database-limits).
 
  * Only SQL statements that are [__deterministic__](https://www.sqlite.org/deterministic.html) are safe to use with rqlite, because statements are committed to the Raft log before they are sent to each node. In other words, rqlite performs _statement-based replication_. For example, the following statement could result in a different SQLite database under each node:
 ```