diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5418b7e..2465cc0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ CMAKE_MINIMUM_REQUIRED (VERSION 2.6)
 PROJECT (xcalib C)
 
 SET (XCALIB_VERSION_MAJOR 0)
-SET (XCALIB_VERSION_MINOR 9)
+SET (XCALIB_VERSION_MINOR 10)
 SET (XCALIB_VERSION_MICRO 0)
 SET (XCALIB_VERSION "${XCALIB_VERSION_MAJOR}.${XCALIB_VERSION_MINOR}.${XCALIB_VERSION_MICRO}")
 SET (XCALIB_VERSION_MAJORMINOR "${XCALIB_VERSION_MAJOR}.${XCALIB_VERSION_MINOR}")
diff --git a/Makefile b/Makefile
index 5a879d2..70c246e 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,7 @@
 # if it doesn't compile right-out-of-the-box, it may be sufficient
 # to change the following variables
 
-XCALIB_VERSION = 0.9
+XCALIB_VERSION = 0.10
 CFLAGS = -O2
 XINCLUDEDIR = /usr/X11R6/include
 XLIBDIR = /usr/X11R6/lib
diff --git a/README.md b/README.md
index e03ab75..223bdb5 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# xcalib 0.9
+# xcalib 0.10
 (c) 2004-2007 Stefan Döhla <stefan AT doehla DOT de>
 This program is GPL-licensed **postcardware!** More infos at end of README.
 This program comes with ABSOLUTELY NO WARRANTY! Use on your own risk.
@@ -227,7 +227,7 @@ utilization by other software.
 
 ### history
 #### 0.10: 2018-01-10
-- Fix incorrect use of X11 screen and output
+- Fix incorrect use of X11 screen and output; rename -s to -o option
 #### 0.9: 2014-11-09
 - fix rounding errors from upsampling of gamma ramps
 - fix -printramps uses integers