diff --git a/src/da65/main.c b/src/da65/main.c
index e315a3a90..cf31c0baa 100644
--- a/src/da65/main.c
+++ b/src/da65/main.c
@@ -371,6 +371,7 @@ static unsigned HandleChangedLength(const OpcDesc* D, unsigned PC)
         if (CPU == CPU_45GS02) {
             if ((D->Handler == OH_Implicit_42_45GS02)) {
                 if (GetCodeByte (PC+1) == 0x42) {
+                    /* NEG:NEG prefix (0x42 0x42) */
                     unsigned opc = GetCodeByte (PC+2);
                     if (opc == 0xea) {
                         /* 42 42 ea */
@@ -385,7 +386,8 @@ static unsigned HandleChangedLength(const OpcDesc* D, unsigned PC)
                         }
                     }
                 }
-            }else if ((D->Handler == OH_Implicit_ea_45GS02)) {
+            } else if ((D->Handler == OH_Implicit_ea_45GS02)) {
+                /* NOP prefix (0xea) */
                 if ((GetCodeByte (PC+1) & 0x1f) == 0x12) {
                     PC += 2;
                 }
diff --git a/src/da65/opc45GS02.c b/src/da65/opc45GS02.c
index a831d539c..90b6a56ab 100644
--- a/src/da65/opc45GS02.c
+++ b/src/da65/opc45GS02.c
@@ -45,7 +45,7 @@
 
 
 
-/* Descriptions for all compound instructions with NEG:NEG prefix */
+/* Descriptions for all compound instructions with NEG:NEG prefix (0x42 0x42) */
 const OpcDesc OpcTable_45GS02_extended[256] = {
     {   "",     1+2,  flIllegal,                OH_Illegal,                  }, /* $00 */
     {   "",     1+2,  flIllegal,                OH_Illegal,                  }, /* $01 */