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 # Rocksdb Change Log
 ## Unreleased
 ### Public API Change
+* DB property "rocksdb.sstables" now prints keys in hex form.
+
+### New Features
+* Measure estimated number of reads per file. The information can be accessed through DB::GetColumnFamilyMetaData or "rocksdb.sstables" DB property.
+
+## 5.6.0 (06/06/2017)
+### Public API Change
 * Scheduling flushes and compactions in the same thread pool is no longer supported by setting `max_background_flushes=0`. Instead, users can achieve this by configuring their high-pri thread pool to have zero threads.
 * Replace `Options::max_background_flushes`, `Options::max_background_compactions`, and `Options::base_background_compactions` all with `Options::max_background_jobs`, which automatically decides how many threads to allocate towards flush/compaction.
 * options.delayed_write_rate by default take the value of options.rate_limiter rate.
 * Replace global variable `IOStatsContext iostats_context` with `IOStatsContext* get_iostats_context()`; replace global variable `PerfContext perf_context` with `PerfContext* get_perf_context()`.
-* DB property "rocksdb.sstables" now prints keys in hex form.
 
 ### New Features
 * Change ticker/histogram statistics implementations to use core-local storage. This improves aggregation speed compared to our previous thread-local approach, particularly for applications with many threads.
 * Users can pass a cache object to write buffer manager, so that they can cap memory usage for memtable and block cache using one single limit.
 * Flush will be triggered when 7/8 of the limit introduced by write_buffer_manager or db_write_buffer_size is triggered, so that the hard threshold is hard to hit.
 * Introduce WriteOptions.low_pri. If it is true, low priority writes will be throttled if the compaction is behind.
-* Measure estimated number of reads per file. The information can be accessed through DB::GetColumnFamilyMetaData or "rocksdb.sstables" DB property.
+* `DB::IngestExternalFile()` now supports ingesting files into a database containing range deletions.
 
 ## 5.5.0 (05/17/2017)
 ### New Features