diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1d96563..eaf9d802 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 #
 
 cmake_minimum_required(VERSION 3.1)
-project(spdlog VERSION 1.3.0 LANGUAGES CXX)
+project(spdlog VERSION 1.3.1 LANGUAGES CXX)
 include(CMakeDependentOption)
 include(GNUInstallDirs)
 
@@ -30,7 +30,6 @@ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCH
     add_compile_options("-Wconversion")
     add_compile_options("-pedantic")
     add_compile_options("-Wfatal-errors")
-    
 endif()
 
 #---------------------------------------------------------------------------------------
@@ -47,11 +46,11 @@ add_library(spdlog::spdlog ALIAS spdlog)
 # Check if spdlog is being used directly or via add_subdirectory
 set(SPDLOG_MASTER_PROJECT OFF)
 if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
-  set(SPDLOG_MASTER_PROJECT ON)
+    set(SPDLOG_MASTER_PROJECT ON)
 endif()
 
 option(SPDLOG_BUILD_EXAMPLES "Build examples" ${SPDLOG_MASTER_PROJECT})
-option(SPDLOG_BUILD_BENCH "Build benchmarks" ${SPDLOG_MASTER_PROJECT})
+option(SPDLOG_BUILD_BENCH "Build benchmarks (Requires https://github.com/google/benchmark.git to be installed)" OFF)
 option(SPDLOG_BUILD_TESTS "Build tests" ${SPDLOG_MASTER_PROJECT})
 option(SPDLOG_FMT_EXTERNAL "Use external fmt library instead of bundled" OFF)
 
diff --git a/README.md b/README.md
index 5509ef30..48264324 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ int main()
     spdlog::info("Positional args are {1} {0}..", "too", "supported");
     spdlog::info("{:<30}", "left aligned");
     
-    spdlog::set_level(spdlog::level::debug/ Set global log level to debug
+    spdlog::set_level(spdlog::level::debug); // Set global log level to debug
     spdlog::debug("This message should be displayed..");    
     
     // change log pattern
diff --git a/bench/CMakeLists.txt b/bench/CMakeLists.txt
index 31636d66..3c4a3f9d 100644
--- a/bench/CMakeLists.txt
+++ b/bench/CMakeLists.txt
@@ -30,20 +30,19 @@ if(NOT TARGET spdlog)
 endif()
 
 find_package(Threads REQUIRED)
+find_package(benchmark CONFIG REQUIRED)
 
 add_executable(bench bench.cpp)
-target_link_libraries(bench spdlog::spdlog Threads::Threads)
+target_link_libraries(bench PRIVATE spdlog::spdlog Threads::Threads)
 
 add_executable(async_bench async_bench.cpp)
-target_link_libraries(async_bench spdlog::spdlog Threads::Threads)
+target_link_libraries(async_bench PRIVATE spdlog::spdlog Threads::Threads)
 
 add_executable(latency latency.cpp)
-set(CMAKE_CXX_STANDARD_LIBRARIES -lbenchmark)
-target_link_libraries(latency spdlog::spdlog Threads::Threads)
+target_link_libraries(latency PRIVATE benchmark::benchmark spdlog::spdlog Threads::Threads)
 
 
 add_executable(formatter-bench formatter-bench.cpp)
-set(CMAKE_CXX_STANDARD_LIBRARIES -lbenchmark)
-target_link_libraries(formatter-bench spdlog::spdlog Threads::Threads)
+target_link_libraries(formatter-bench PRIVATE benchmark::benchmark spdlog::spdlog Threads::Threads)
 
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/logs")
diff --git a/include/spdlog/details/log_msg.h b/include/spdlog/details/log_msg.h
index 5913c3b0..69422ba3 100644
--- a/include/spdlog/details/log_msg.h
+++ b/include/spdlog/details/log_msg.h
@@ -25,9 +25,9 @@ struct log_msg
 
 #ifndef SPDLOG_NO_THREAD_ID
         , thread_id(os::thread_id())
+#endif
         , source(loc)
         , payload(view)
-#endif
     {
     }
 
diff --git a/include/spdlog/sinks/android_sink.h b/include/spdlog/sinks/android_sink.h
index 0742b247..ae7f7733 100644
--- a/include/spdlog/sinks/android_sink.h
+++ b/include/spdlog/sinks/android_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/fmt_helper.h"
diff --git a/include/spdlog/sinks/ansicolor_sink.h b/include/spdlog/sinks/ansicolor_sink.h
index bb2a2a12..7c5e3539 100644
--- a/include/spdlog/sinks/ansicolor_sink.h
+++ b/include/spdlog/sinks/ansicolor_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/console_globals.h"
diff --git a/include/spdlog/sinks/basic_file_sink.h b/include/spdlog/sinks/basic_file_sink.h
index 0ab884aa..facc7209 100644
--- a/include/spdlog/sinks/basic_file_sink.h
+++ b/include/spdlog/sinks/basic_file_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/file_helper.h"
@@ -30,6 +30,11 @@ public:
         file_helper_.open(filename, truncate);
     }
 
+    const filename_t &filename() const
+    {
+        return file_helper_.filename();
+    }
+
 protected:
     void sink_it_(const details::log_msg &msg) override
     {
diff --git a/include/spdlog/sinks/daily_file_sink.h b/include/spdlog/sinks/daily_file_sink.h
index d20de442..08392c16 100644
--- a/include/spdlog/sinks/daily_file_sink.h
+++ b/include/spdlog/sinks/daily_file_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/file_helper.h"
@@ -63,6 +63,11 @@ public:
         rotation_tp_ = next_rotation_tp_();
     }
 
+    const filename_t &filename() const
+    {
+        return file_helper_.filename();
+    }
+
 protected:
     void sink_it_(const details::log_msg &msg) override
     {
diff --git a/include/spdlog/sinks/dist_sink.h b/include/spdlog/sinks/dist_sink.h
index 8ed41f1a..44de3913 100644
--- a/include/spdlog/sinks/dist_sink.h
+++ b/include/spdlog/sinks/dist_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "base_sink.h"
diff --git a/include/spdlog/sinks/msvc_sink.h b/include/spdlog/sinks/msvc_sink.h
index c8e60be7..f06c16c7 100644
--- a/include/spdlog/sinks/msvc_sink.h
+++ b/include/spdlog/sinks/msvc_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #if defined(_WIN32)
diff --git a/include/spdlog/sinks/null_sink.h b/include/spdlog/sinks/null_sink.h
index ffab7a52..54f322c4 100644
--- a/include/spdlog/sinks/null_sink.h
+++ b/include/spdlog/sinks/null_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/null_mutex.h"
diff --git a/include/spdlog/sinks/ostream_sink.h b/include/spdlog/sinks/ostream_sink.h
index b28802a0..22e377b6 100644
--- a/include/spdlog/sinks/ostream_sink.h
+++ b/include/spdlog/sinks/ostream_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/null_mutex.h"
diff --git a/include/spdlog/sinks/rotating_file_sink.h b/include/spdlog/sinks/rotating_file_sink.h
index 15367cc8..0f057ad9 100644
--- a/include/spdlog/sinks/rotating_file_sink.h
+++ b/include/spdlog/sinks/rotating_file_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/file_helper.h"
@@ -60,6 +60,11 @@ public:
         return fmt::to_string(w);
     }
 
+    const filename_t &filename() const
+    {
+        return file_helper_.filename();
+    }
+
 protected:
     void sink_it_(const details::log_msg &msg) override
     {
diff --git a/include/spdlog/sinks/stdout_color_sinks.h b/include/spdlog/sinks/stdout_color_sinks.h
index f0475692..74bfceb4 100644
--- a/include/spdlog/sinks/stdout_color_sinks.h
+++ b/include/spdlog/sinks/stdout_color_sinks.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #ifdef _WIN32
diff --git a/include/spdlog/sinks/stdout_sinks.h b/include/spdlog/sinks/stdout_sinks.h
index efbbaaac..bf8e9790 100644
--- a/include/spdlog/sinks/stdout_sinks.h
+++ b/include/spdlog/sinks/stdout_sinks.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/details/console_globals.h"
diff --git a/include/spdlog/sinks/syslog_sink.h b/include/spdlog/sinks/syslog_sink.h
index 4df49b87..c3bcd844 100644
--- a/include/spdlog/sinks/syslog_sink.h
+++ b/include/spdlog/sinks/syslog_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/sinks/base_sink.h"
diff --git a/include/spdlog/sinks/wincolor_sink.h b/include/spdlog/sinks/wincolor_sink.h
index 6e2b0122..1fdf8c56 100644
--- a/include/spdlog/sinks/wincolor_sink.h
+++ b/include/spdlog/sinks/wincolor_sink.h
@@ -6,7 +6,7 @@
 #pragma once
 
 #ifndef SPDLOG_H
-#error "spdlog.h must be included before this file."
+#include "spdlog/spdlog.h"
 #endif
 
 #include "spdlog/common.h"
diff --git a/include/spdlog/version.h b/include/spdlog/version.h
index 16b9194b..87a68bd1 100644
--- a/include/spdlog/version.h
+++ b/include/spdlog/version.h
@@ -7,6 +7,6 @@
 
 #define SPDLOG_VER_MAJOR 1
 #define SPDLOG_VER_MINOR 3
-#define SPDLOG_VER_PATCH 0
+#define SPDLOG_VER_PATCH 1
 
 #define SPDLOG_VERSION (SPDLOG_VER_MAJOR * 10000 + SPDLOG_VER_MINOR * 100 + SPDLOG_VER_PATCH)