diff --git a/README.md b/README.md
index 8aca68e846041fee8c947a5410c32f7a3a60f5e4..b8bc6fe499eb8ce73b74ee518acde96cbb78eb74 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ Then copy your resulting wheel and install it via pip on the target system.
 
 ## v0.5.1
 
-* _TBA_
+* added `VarlenSeries.close_chunks`
 
 ## v0.5
 
diff --git a/setup.py b/setup.py
index 414591f089b23acf593e3882a55c016a8cccba0b..bb898a393a5552c5c5da460e18706436d0c56cf0 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ if 'CI' in os.environ:
 
 
 setup(name='tempsdb',
-      version='0.5.1a1',
+      version='0.5.1a2',
       packages=['tempsdb'],
       install_requires=['satella>=2.14.24', 'ujson', 'indexed_gzip'],
       ext_modules=build([Multibuild('tempsdb', find_pyx('tempsdb'), **ext_kwargs), ],
diff --git a/tempsdb/varlen.pxd b/tempsdb/varlen.pxd
index 76990eda0e1f8d889550a3b8cf5d29bbdf4c8846..f5bef0b6e5b03d7d7b01f6db721a0dd84de56716 100644
--- a/tempsdb/varlen.pxd
+++ b/tempsdb/varlen.pxd
@@ -24,6 +24,7 @@ cdef class VarlenSeries:
     cdef int get_length_for(self, int index)
     cpdef int trim(self, unsigned long long timestamp) except -1
     cdef int add_series(self) except -1
+    cpdef int close_chunks(self) except -1
     cdef void register_memory_pressure_manager(self, object mpm)
     cpdef int append(self, unsigned long long timestamp, bytes data) except -1
     cpdef long long get_maximum_length(self) except -1
diff --git a/tempsdb/varlen.pyx b/tempsdb/varlen.pyx
index e79abe2e34b4c3a78f50d10ca67499c2fd054b3f..25997cbec1a0af84bed2d75eada7a28ac40794c0 100644
--- a/tempsdb/varlen.pyx
+++ b/tempsdb/varlen.pyx
@@ -429,6 +429,15 @@ cdef class VarlenSeries:
         for series in self.series:
             series.register_memory_pressure_manager(mpm)
 
+    cpdef int close_chunks(self) except -1:
+        """
+        Close unnecessary chunks
+        """
+        cdef TimeSeries series
+        for series in self.series:
+            series.close_chunks()
+        return 0
+
     cpdef VarlenIterator iterate_range(self, unsigned long long start, unsigned long long stop,
                                        bint direct_bytes=False):
         """