diff --git a/en/_posts/index.xml b/en/_posts/index.xml
index 56a1e4e..c876563 100644
--- a/en/_posts/index.xml
+++ b/en/_posts/index.xml
@@ -242,8 +242,7 @@ If a new button is defined (file name "20" exists), uweb also
[Engine name]:[url with '%s' as keyword]
[Engine name]:POST:[post params with '%s' as keyword]:[url]
[Engine name]:[Extra request headers]:[post params with '%s' as keyword]:[url]
-[Extra request headers] Ex. "X-Forwarded-For;8.8.8.8" Limitations (they are here for performance reasons):
-The first engine in the file must be the first type that has no '%s' in the engine url.
+[Extra request headers] Ex. "X-Forwarded-For;8.8.8.8" when [post params] is empty, the url should have '%s' as keyword. Ex. bingUS engine w/ chatgpt Limitations (they are here for performance reasons):
diff --git a/en/index.xml b/en/index.xml
index 9cc662a..9f4ac86 100644
--- a/en/index.xml
+++ b/en/index.xml
@@ -375,8 +375,7 @@ If a new button is defined (file name "20" exists), uweb also
[Engine name]:[url with '%s' as keyword]
[Engine name]:POST:[post params with '%s' as keyword]:[url]
[Engine name]:[Extra request headers]:[post params with '%s' as keyword]:[url]
-[Extra request headers] Ex. "X-Forwarded-For;8.8.8.8" Limitations (they are here for performance reasons):
-The first engine in the file must be the first type that has no '%s' in the engine url.
+[Extra request headers] Ex. "X-Forwarded-For;8.8.8.8" when [post params] is empty, the url should have '%s' as keyword. Ex. bingUS engine w/ chatgpt Limitations (they are here for performance reasons):
diff --git a/en/searchcat/index.html b/en/searchcat/index.html
index c3a2bbb..486d9bb 100644
--- a/en/searchcat/index.html
+++ b/en/searchcat/index.html
@@ -56,6 +56,7 @@
[Engine name]:[Extra request headers]:[post params with '%s' as keyword]:[url]