diff --git a/.travis.yml b/.travis.yml
index 20ef6e32..82604edf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,7 +44,7 @@ matrix:
 
 before_install:
   - cd ..
-  - git clone --depth=1 --branch=hotfix https://github.com/qPCR4vir/nana-demo.git nana-demo
+  - git clone --depth=1 --branch=develop https://github.com/qPCR4vir/nana-demo.git nana-demo
   - export PATH="$HOME/bin:$PATH"
   - wget --no-check-certificate --no-clobber -O /tmp/tools/cmake https://cmake.org/files/v3.12/cmake-3.12.0-rc3-Linux-x86_64.sh || true
   - chmod -R +x /tmp/tools
@@ -63,7 +63,7 @@ before_script :
   - cd demo-build
 
 script:
-  - cmake -G"Unix Makefiles" ../nana-demo -DCMAKE_INSTALL_PREFIX=.. -DNANA_CMAKE_ENABLE_JPEG=ON -DNANA_CMAKE_FIND_BOOST_FILESYSTEM=OFF -DNANA_CMAKE_AUTOMATIC_GUI_TESTING=ON
+  - cmake -G"Unix Makefiles" ../nana-demo -DCMAKE_INSTALL_PREFIX=.. -DNANA_CMAKE_ENABLE_JPEG=ON -DNANA_CMAKE_FIND_BOOST_FILESYSTEM=OFF -DNANA_CMAKE_AUTOMATIC_GUI_TESTING=ON -DNANA_CMAKE_INSTALL=OFF
   - make install
   # todo: separate resources from sources (a directory for images)
   - ls
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1814e4fb..69e1de1d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@
 # cmake 3.12 have more better modern c++ support
 
 cmake_minimum_required(VERSION 3.12  FATAL_ERROR)
-project(nana VERSION      1.6.2
+project(nana VERSION      1.7.1
         DESCRIPTION "C++ GUI library"
         HOMEPAGE_URL http://nanapro.org
         LANGUAGES CXX         )
diff --git a/appveyor.yml b/appveyor.yml
index 4305ba46..ab87092f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,6 @@
 version: 1.0.{build}
+image:
+  - Visual Studio 2017
 build:
-  project: build\vc2015\nana.sln
+  project: build\vc2017\nana.sln
   verbosity: minimal
\ No newline at end of file
diff --git a/build/cmake/compilers.cmake b/build/cmake/compilers.cmake
index 80daf9e9..c8db4976 100644
--- a/build/cmake/compilers.cmake
+++ b/build/cmake/compilers.cmake
@@ -14,8 +14,7 @@
 
 if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") #  AND NOT MINGW??
 
-    target_compile_options(nana PRIVATE  -Wall
-                                 PUBLIC  -g   )
+    target_compile_options(nana PRIVATE  -Wall)
 
         # todo: set in target property of nana
     set(CMAKE_CXX_FLAGS_RELEASE "-O3 -march=native -mtune=native -DNDEBUG")
diff --git a/build/cmake/install_nana.cmake b/build/cmake/install_nana.cmake
index 2b6851d6..45636484 100644
--- a/build/cmake/install_nana.cmake
+++ b/build/cmake/install_nana.cmake
@@ -1,8 +1,8 @@
-option(NANA_CMAKE_INSTALL "Install nana when compile the library (to be consumed without cmake)" OFF)
+option(NANA_CMAKE_INSTALL "Install nana when compile the library (to be consumed without cmake)" ON)
 
 # Install the include directories too.
 if(NANA_CMAKE_INSTALL)
-    # this is the prefered method to consume nana directly with some specific bulid system
+    # This is a method to consume nana with a bulid system not directly supported by nana.
     # Is your responsability to ensure all compiler options are compatible with the compilation
     # of the project linking to the nana lib here generated
     target_sources(nana PRIVATE ${HEADERS})
diff --git a/build/cmake/shared_libs.cmake b/build/cmake/shared_libs.cmake
index 104e252f..febb3b42 100644
--- a/build/cmake/shared_libs.cmake
+++ b/build/cmake/shared_libs.cmake
@@ -40,7 +40,7 @@ if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") #  AN
     if(BUILD_SHARED_LIBS)
         target_compile_options(nana PUBLIC  -lgcc -lstdc++)
     else()
-        target_link_libraries(nana PUBLIC -static -static-libstdc++)
+        target_link_libraries(nana PUBLIC  -static-libgcc -static-libstdc++)
     endif(BUILD_SHARED_LIBS)
 
 endif()
\ No newline at end of file
diff --git a/include/nana/gui/widgets/group.hpp b/include/nana/gui/widgets/group.hpp
index 43dd5e85..139f7f15 100644
--- a/include/nana/gui/widgets/group.hpp
+++ b/include/nana/gui/widgets/group.hpp
@@ -100,6 +100,10 @@ namespace nana{
 		group& enable_format_caption(bool format);
 
 		group& collocate() noexcept;
+
+		/// this will set the `usr_div_str` for an internal field, called the "user field".
+		/// The "full" `place` of a `group` widget is internally divided into a field for the title,
+		/// a field for the added "options" and a field for "user" widgets.
 		group& div(const char* div_str) noexcept;
 		field_reference operator[](const char* field);