diff --git a/src/core/hle/service/apt/apt.h b/src/core/hle/service/apt/apt.h
index f8d19ded6..5f92c6e29 100644
--- a/src/core/hle/service/apt/apt.h
+++ b/src/core/hle/service/apt/apt.h
@@ -300,12 +300,14 @@ void PrepareToStartLibraryApplet(Service::Interface* self);
 void StartLibraryApplet(Service::Interface* self);
 
 /**
-* From 3Ds Brew:
-*	This writes an output u8 to cmdreply indexword[2].
-*	This uses PTMSYSM:CheckNew3DS.
-*	When a certain NS state field (internal NS state in .data/.bss.) is non-zero, the output value is zero, otherwise the output is from PTMSYSM:CheckNew3DS. 
-*	Normally this NS state field is zero, however this state field is set to 1 when APT:PrepareToStartApplication is used with flags bit8 is set.
-*/
+ * APT::Unknown_0x01010000 service function
+ *  Inputs:
+ *      0 : Command header [0x01010000]
+ *  Outputs:
+ *      0 : Return header
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : Result of function, 0 if unknown NS state field is set, or result of PTM:CheckNew3DS
+ */
 void Unknown_0x01010000(Service::Interface* self);
 
 /// Initialize the APT service