diff --git a/nx/include/switch/services/set.h b/nx/include/switch/services/set.h
index 6c862982..5dae946b 100644
--- a/nx/include/switch/services/set.h
+++ b/nx/include/switch/services/set.h
@@ -184,6 +184,6 @@ Result setsysGetDeviceNickname(char* buffer);
 
 /**
  * @brief Sets the system's nickname.
- * @param buffer Pointer to read the nickname from.
+ * @param buffer Pointer to read the nickname from. (The buffer size needs to be at least 0x80 bytes)
  */
 Result setsysSetDeviceNickname(char* buffer);