diff --git a/README.md b/README.md
index 3d6f853..a121406 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,8 @@ Use spdlog as log tool and the default level is 'info'.
 
 ### Features
 
-* Fast - with the same number of threads `FastDup` is ~3.5X faster than GATK MarkDuplicatesSpark.
-  And `FastDup` achives ~15X performance improvement than Picard MarkDuplicates.
+* Fast - with the same number of threads `FastDup` is ~8X faster than GATK MarkDuplicatesSpark.
+  And `FastDup` achives ~20X performance improvement than Picard MarkDuplicates.
 * Generate identical outputs compared to Picard MarkDuplicates.
 * The same detailed metrics data witch Picard MarkDuplicates.
 * All data processed in memory and low-memory footprint even for large input files. 
@@ -42,6 +42,7 @@ Use spdlog as log tool and the default level is 'info'.
 * libbz2
 * liblzma
 * libcurl
+* OpenSSL
 * libdeflate (optional)
 
 ## Install
@@ -69,11 +70,11 @@ The generated binary fastdup will be in the build/bin folder.
 1. get help
 
 ```bash
-fastdup --help
+./fastdup --help
 ```
 
 2. mark duplicates on an input BAM file using 8 threads
 
 ```bash
-fastdup --input in.bam --output out.bam --metrics stats.txt --num-threads 8
+./fastdup --input in_test.bam --output out_md.bam --metrics stats.txt --num-threads 8
 ```
\ No newline at end of file
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a80c2de..3d49937 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -84,6 +84,14 @@ else()
     message(FATAL_ERROR "lm is not found")
 endif()
 
+# ssl
+find_package(OpenSSL REQUIRED)
+if(OpenSSL_FOUND)
+    target_link_libraries(${PG_NAME} OpenSSL::SSL OpenSSL::Crypto)
+else()
+    message(FATAL_ERROR "OpenSSL is not found")
+endif()
+
 # install path
 install(TARGETS ${PG_NAME}
     RUNTIME DESTINATION bin
diff --git a/test/in_test.bam b/test/in_test.bam
new file mode 100644
index 0000000..7ba2692
Binary files /dev/null and b/test/in_test.bam differ