diff --git a/desmume/src/arm_instructions.cpp b/desmume/src/arm_instructions.cpp
index 43ae1af65..c25112be0 100644
--- a/desmume/src/arm_instructions.cpp
+++ b/desmume/src/arm_instructions.cpp
@@ -6809,7 +6809,7 @@ TEMPLATE static u32 FASTCALL  OP_SWI(const u32 i)
 {
 	u32 swinum = (cpu->instruction>>16)&0xFF;
 	
-	//ideas-style debug prints
+	//ideas-style debug prints (execute this SWI with the null terminated string address in R0)
 	if(swinum==0xFC) 
 	{
 		IdeasLog(cpu);
diff --git a/desmume/src/thumb_instructions.cpp b/desmume/src/thumb_instructions.cpp
index 3fb57349b..c71d288ad 100644
--- a/desmume/src/thumb_instructions.cpp
+++ b/desmume/src/thumb_instructions.cpp
@@ -953,7 +953,7 @@ TEMPLATE static  u32 FASTCALL OP_SWI_THUMB(const u32 i)
 {
 	u32 swinum = cpu->instruction & 0xFF;
 
-	//ideas-style debug prints
+	//ideas-style debug prints (execute this SWI with the null terminated string address in R0)
 	if(swinum==0xFC) {
 		IdeasLog(cpu);
 		return 0;