diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4794908..5fdd5867 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 3. `ev_file_seek()` is able to operator in synchronous mode.
 4. support normal `ev_file_read()` and `ev_file_write()`.
 5. support `ev_file_pread()` and `ev_file_pwrite()`.
+6. support file mapping.
 
 ### Bug Fixes
 1. `ev_hrtime()` no longer require initialize event loop first.
diff --git a/ev.h b/ev.h
index 4a3f1ef1..7aa0fe89 100644
--- a/ev.h
+++ b/ev.h
@@ -50,6 +50,7 @@
  * 3. `ev_file_seek()` is able to operator in synchronous mode.
  * 4. support normal `ev_file_read()` and `ev_file_write()`.
  * 5. support `ev_file_pread()` and `ev_file_pwrite()`.
+ * 6. support file mapping.
  * 
  * ### Bug Fixes
  * 1. `ev_hrtime()` no longer require initialize event loop first.
@@ -298,7 +299,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 // FILE:    ev/version.h
 // SIZE:    1188
-// SHA-256: f3efcc012de35bb4e13758f52149dd33b74d2af1e64ac6f43a19db1474ecaaff
+// SHA-256: 85892e46e72b2a91b14a6339ca037e90cfd9b3643afc12cc57eb24d7f3aa0234
 ////////////////////////////////////////////////////////////////////////////////
 // #line 1 "ev/version.h"
 #ifndef __EV_VERSION_H__
@@ -330,7 +331,7 @@ extern "C" {
 /**
  * @brief Development version.
  */
-#define EV_VERSION_PREREL           8
+#define EV_VERSION_PREREL           9
 
 /**
  * @brief Version calculate helper macro.
diff --git a/include/ev/version.h b/include/ev/version.h
index 18f9d01c..7b811bef 100644
--- a/include/ev/version.h
+++ b/include/ev/version.h
@@ -27,7 +27,7 @@ extern "C" {
 /**
  * @brief Development version.
  */
-#define EV_VERSION_PREREL           8
+#define EV_VERSION_PREREL           9
 
 /**
  * @brief Version calculate helper macro.