diff --git a/.vscode/launch.json b/.vscode/launch.json
index 968b3b1..cf83850 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -7,7 +7,7 @@
             "request": "launch",
             "program": "${workspaceFolder}/bin/tcpu",
             "windows": { "program": "${workspaceFolder}/bin/tcpu.exe" },
-            "args": [ "-c", "s.tasm", "o.bin" ],
+            "args": [ "-c", "../examples/s.tasm", "o.bin", "--debug" ],
             "cwd": "${workspaceFolder}/bin",
             "preLaunchTask": "build_exec_dbg",
             "stopAtEntry": false,
diff --git a/examples/s.tasm b/examples/s.tasm
new file mode 100644
index 0000000..9c86ae8
--- /dev/null
+++ b/examples/s.tasm
@@ -0,0 +1,14 @@
+/*
+"hello world" program in my assembly language
+*/
+
+// named data array
+c8 msg "Hello, World :3\0"
+
+push ax 1; // sys_write
+push bx 1; // stdout
+push cx @msg; // address of msg data
+push dx #msg; // size of msg data
+sys
+push ax 0
+exit
diff --git a/src/compiler/Compiler.c b/src/compiler/Compiler.c
index d15aa5b..26d9b48 100644
--- a/src/compiler/Compiler.c
+++ b/src/compiler/Compiler.c
@@ -61,7 +61,7 @@ static bool compileFile(Compiler* cmp, FILE* f){
     return true;
 }
 
-bool Compiler_compile(Compiler* cmp, cstr source_file_name, cstr out_file_name, bool debug){
+bool Compiler_compile(Compiler* cmp, cstr source_file_name, cstr out_file_name, bool debug_log){
     FILE* f = fopen(source_file_name, "rb");
     if(f == NULL)
         returnError("ERROR: can't open file '%s'", source_file_name);
@@ -94,14 +94,14 @@ bool Compiler_compile(Compiler* cmp, cstr source_file_name, cstr out_file_name,
         returnError("ERROR: can't open file '%s'", out_file_name);
     }
 
-    if(debug){
+    if(debug_log){
         printf("----------------------------------[%s]---------------------------------\n", source_file_name);
         fputs(cmp->code, stdout);
         fputc('\n', stdout);
     }
     
     bool success = Compiler_lex(cmp);
-    if(debug){
+    if(debug_log){
         printf("------------------------------------[lines]-----------------------------------\n");
         for(u32 i = 0; i < cmp->line_lengths.len; i++){
             printf("[%u] length: %u\n", i+1, cmp->line_lengths.data[i]);
diff --git a/src/main.c b/src/main.c
index d6c3658..f8dba23 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,7 +5,7 @@
 
 #define arg_is(STR) (strcmp(argv[argi], STR) == 0)
 
-i32 compileSources(cstr source_file, cstr out_file);
+i32 compileSources(cstr source_file, cstr out_file, bool debug_log);
 i32 bootFromImage(cstr image_file);
 
 i32 main(const i32 argc, cstr* argv){
@@ -21,6 +21,8 @@ i32 main(const i32 argc, cstr* argv){
     cstr NULLABLE(out_file) = NULL;
     cstr NULLABLE(source_file) = NULL;
 
+    bool debug_log = false;
+
     for(i32 argi = 1; argi < argc; argi++){
         if(arg_is("-h") || arg_is("--help")){
             printf(
@@ -28,6 +30,7 @@ i32 main(const i32 argc, cstr* argv){
                 "-op, --opcodes                             Show list of all instructions.\n"
                 "-i, --image [FILE]                         Boot VM using image file.\n"
                 "-c, --compile [SOURCE_FILE] [OUT_FILE]     Compile assembly source files to machine code.\n"
+                "-d, --debug                                Enable debug log.\n"
             );
             return 0;
         }
@@ -72,6 +75,9 @@ i32 main(const i32 argc, cstr* argv){
             }
             out_file = argv[argi];
         }
+        else if(arg_is("-d") || arg_is("--debug")){
+            debug_log = true;
+        }
         else {
             printfe("ERROR: unknown argument '%s'\n", argv[argi]);
             return 1;
@@ -80,7 +86,7 @@ i32 main(const i32 argc, cstr* argv){
 
     i32 exit_code = 0;
     if(compile){
-        exit_code = compileSources(source_file, out_file);
+        exit_code = compileSources(source_file, out_file, debug_log);
     }
     if(exit_code == 0 && boot){
         exit_code = bootFromImage(image_file);
@@ -131,10 +137,10 @@ i32 bootFromImage(cstr image_file){
     return exit_code;
 }
 
-i32 compileSources(cstr source_file, cstr out_file){
+i32 compileSources(cstr source_file, cstr out_file, bool debug_log){
     Compiler cmp;
     Compiler_init(&cmp);
-    bool success = Compiler_compile(&cmp, source_file, out_file, true);
+    bool success = Compiler_compile(&cmp, source_file, out_file, debug_log);
     if(!success){
         if(cmp.error_message){
             printfe("COMPILER ERROR: %s\n", cmp.error_message);