diff --git a/libctru/include/3ds/services/ptmu.h b/libctru/include/3ds/services/ptmu.h
index a5822ce..82773ef 100644
--- a/libctru/include/3ds/services/ptmu.h
+++ b/libctru/include/3ds/services/ptmu.h
@@ -1,3 +1,4 @@
+
 /**
  * @file ptmu.h
  * @brief PTMU service.
@@ -40,3 +41,8 @@ Result PTMU_GetPedometerState(u8 *out);
  */
 Result PTMU_GetTotalStepCount(u32 *steps);
 
+/**
+ * @brief Gets whether the adapter is plugged in or not
+ * @param out Pointer to write the adapter state to. (0 = not plugged in, 1 = plugged in)
+ */
+Result PTMU_GetAdapterState(u8 *out);