diff --git a/CHANGELOG.org b/CHANGELOG.org
index c546c7a..71f44cd 100644
--- a/CHANGELOG.org
+++ b/CHANGELOG.org
@@ -1,8 +1,9 @@
 - v0.1.9
-  - command line options are updated, most should be compatible to old version
+  - command line options are re-designed
   - upgrade to zstd v1.5.2
+  - recover the original order of SNPs loading for fancy batch mode
   - add =--no-shuffle= option, remove =--shuffle= option
-  - default PCAone algorithm is chose.
+  - default PCAoneF (fancy RSVD) algorithm is chose.
 
 - v0.1.8
   - add -a, --tmp options
diff --git a/Makefile b/Makefile
index 2012e79..cf028d4 100755
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ $(info "building PCAone on ${Platform} -- version ${VERSION}")
 program       = PCAone
 # use default g++ only if not set in env
 CXX           ?= g++
-CXXFLAGS	  += -O3 -Wall -std=c++11 -ffast-math -m64 -Wno-c11-extensions -fPIC
+CXXFLAGS	  += -O3 -Wall -std=c++11 -ffast-math -m64 -fPIC
 MYFLAGS        = -DVERSION=\"$(VERSION)\" -DNDEBUG
 LDFLAGS       += -s  # this is obsolete and igonored on mac
 # CURRENT_DIR   = $(shell pwd)