diff --git a/README.md b/README.md
new file mode 100644
index 0000000..40c92ae
--- /dev/null
+++ b/README.md
@@ -0,0 +1,5 @@
+# 8086 dissassembler
+
+For [Computer, Enhance!](https://www.computerenhance.com/)
+
+Reference: https://edge.edx.org/c4x/BITSPilani/EEE231/asset/8086_family_Users_Manual_1_.pdf
\ No newline at end of file
diff --git a/src/asm.c b/src/asm.c
index d8fdcc6..fd9bf32 100644
--- a/src/asm.c
+++ b/src/asm.c
@@ -31,7 +31,7 @@ void dissassemble(FILE *src, FILE *dst) {
             u8 mod =  byte2 & 0b11000000;
             u8 reg = (byte2 & 0b00111000) >> 3;
             u8 rm  =  byte2 & 0b00000111;
-            if (mod == 0b11000000) {
+            if (mod == 0b11000000) { // Mod = 0b11
                 const char *reg_name = lookup_reg_name(reg, wide);
                 const char *rm_name  = lookup_reg_name(rm, wide);
                 if (direction) {
@@ -39,9 +39,9 @@ void dissassemble(FILE *src, FILE *dst) {
                 } else {
                     fprintf(dst, "mov %s, %s\n", rm_name, reg_name);
                 }
-            } else {
-                printf("ERROR: Unsupported mod '%d'", mod);
-                abort();
+            } else if (mod == 0b10000000) { // Mod = 0b10
+            } else if (mod == 0b01000000) { // Mod = 0b01
+            } else if (mod == 0b00000000) { // Mod = 0b00
             }
         }
     }