diff --git a/curl_easy_externals.e b/curl_easy_externals.e
index 73259dab..3fdb7e36 100644
--- a/curl_easy_externals.e
+++ b/curl_easy_externals.e
@@ -95,6 +95,7 @@ feature -- Command
 
 	perform (a_curl_handle: POINTER): INTEGER is
 			-- Declared as curl_easy_perform().
+			-- Result is one value from {CURL_CODES}
 		require
 			exists: a_curl_handle /= default_pointer
 		local
@@ -145,6 +146,8 @@ feature -- Special setting
 
 	set_write_function (a_curl_handle: POINTER) is
 				-- Set cURL write function
+				-- Set cURL write function with Eiffel default write function.
+				-- So we can use CURL_STRING as parameter in {CURL_EASY_EXTERNALS}.setopt_curl_string when the option is {CURL_OPT_CONSTANTS}.curlopt_writedata
 		require
 			exists: a_curl_handle /= default_pointer
 		local
diff --git a/curl_externals.e b/curl_externals.e
index d834c389..d430736e 100644
--- a/curl_externals.e
+++ b/curl_externals.e
@@ -25,6 +25,17 @@ feature -- Command
 			end
 		end
 
+	global_cleanup is
+			-- Declared as curl_global_cleanup().
+		local
+			l_ptr: POINTER
+		do
+			l_ptr := api_loader.safe_load_api (module_name, "curl_global_cleanup")
+			if l_ptr /= default_pointer then
+				c_curl_global_cleanup (l_ptr);
+			end
+		end
+
 	formadd_string_string (a_form: CURL_FORM; a_last_pointer: CURL_FORM; a_arg_1: INTEGER; a_arg_1_value: STRING_GENERAL; a_arg_2: INTEGER; a_arg_2_value: STRING_GENERAL; a_arg_3: INTEGER) is
 			-- Declared as curl_formadd ().
 		require
@@ -165,7 +176,7 @@ feature {NONE} -- C externals
 		end
 
 	c_curl_global_init (a_api: POINTER; a_opt: NATURAL_64) is
-			-- `a_api' point to AIP curl_global_init ()
+			-- `a_api' point to API curl_global_init ()
 			-- `a_opt' is intialization option.
 		require
 			exists: a_api /= default_pointer
@@ -177,6 +188,18 @@ feature {NONE} -- C externals
 			]"
 		end
 
+	c_curl_global_cleanup (a_api: POINTER) is
+			-- `a_api' point to API curl_global_cleanup()
+		require
+			exists: a_api /= default_pointer
+		external
+			"C inline use <curl/curl.h>"
+		alias
+			"[
+				(FUNCTION_CAST(void, ()) $a_api)();
+			]"
+		end
+
 	c_slist_append (a_api: POINTER; a_list_pointer: POINTER; a_string: POINTER): POINTER is
 			-- Declared as curl_slist_append ().
 		require