diff --git a/src/main.cpp b/src/main.cpp
index 2108732..aac8a13 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -88,7 +88,9 @@ std::ostream& logo(std::ostream& out) {
     << "repo : https://gitee.com/valkmjolnir/Nasal-Interpreter\n"
     << "wiki : https://wiki.flightgear.org/Nasal_scripting_language\n"
     << "\n"
-    << "presented by fgprc members - http://fgprc.org.cn\n"
+    << "presented by fgprc members\n"
+    << "  - fgprc    : http://fgprc.org\n"
+    << "  - fgprc.cn : http://fgprc.org.cn\n"
     << "\n"
     << "input <nasal -h> to get help .\n\n";
     return out;
diff --git a/src/nasal_dbg.cpp b/src/nasal_dbg.cpp
index 64d911c..cc1bc9c 100644
--- a/src/nasal_dbg.cpp
+++ b/src/nasal_dbg.cpp
@@ -13,7 +13,7 @@ void operand_line_counter::load_file_line_counter(
     file_name_list = file_list;
     file_line_counter = {};
     file_contents = {};
-    flstream fs;
+    filestream fs;
     for(usize i =0; i<file_list.size(); ++i) {
         fs.load(file_list[i]);
         file_contents.push_back(fs.file_content());
diff --git a/src/nasal_err.cpp b/src/nasal_err.cpp
index c57aa20..9142027 100644
--- a/src/nasal_err.cpp
+++ b/src/nasal_err.cpp
@@ -71,7 +71,7 @@ std::ostream& reset(std::ostream& s) {
     return s;
 }
 
-void flstream::load(const std::string& f) {
+void filestream::load(const std::string& f) {
     if (file==f) { // don't need to load a loaded file
         return;
     }
diff --git a/src/nasal_err.h b/src/nasal_err.h
index a1cdf32..13552c9 100644
--- a/src/nasal_err.h
+++ b/src/nasal_err.h
@@ -29,13 +29,13 @@ std::ostream& orange(std::ostream&);
 std::ostream& white(std::ostream&);
 std::ostream& reset(std::ostream&);
 
-class flstream {
+class filestream {
 protected:
     std::string file;
     std::vector<std::string> res;
 
 public:
-    flstream(): file("") {}
+    filestream(): file("") {}
     void load(const std::string&);
     const std::string& operator[](usize n) const {return res[n];}
     const auto& name() const {return file;}
@@ -43,7 +43,7 @@ public:
     usize size() const {return res.size();}
 };
 
-class error: public flstream {
+class error: public filestream {
 private:
     u32 cnt; // counter for errors
 
diff --git a/src/nasal_misc.cpp b/src/nasal_misc.cpp
index 13f7f30..77da7dc 100644
--- a/src/nasal_misc.cpp
+++ b/src/nasal_misc.cpp
@@ -105,7 +105,7 @@ const char* get_platform() {
     } else if (is_macos()) {
         return "macOS";
     }
-    return "unknown platform";
+    return "unknown";
 }
 
 const char* get_arch() {
@@ -126,7 +126,7 @@ const char* get_arch() {
     } else if (is_superh()) {
         return "superh";
     }
-    return "unknown arch";
+    return "unknown";
 }
 
 f64 hex_to_f64(const char* str) {