diff --git a/libctru/include/3ds/services/ptmu.h b/libctru/include/3ds/services/ptmu.h
index 82773ef..4b1a61c 100644
--- a/libctru/include/3ds/services/ptmu.h
+++ b/libctru/include/3ds/services/ptmu.h
@@ -43,6 +43,6 @@ 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)
+ * @param out Pointer to write the adapter state to.
  */
-Result PTMU_GetAdapterState(u8 *out);
+Result PTMU_GetAdapterState(bool *out);