diff --git a/Requirements.md b/Requirements.md
index 6b18261..56e78ff 100644
--- a/Requirements.md
+++ b/Requirements.md
@@ -3,5 +3,6 @@
   - PHP 5.6 (or higher)
   - `openssl` extension
   - `libxml` extension
+  - `allow_url_fopen` enabled (`On` or `1`)
 
-Turn on the OpenSSL support by un-commenting the line `extension=php_openssl.dll` in your PHP configuration (`php.ini`)
\ No newline at end of file
+Enable extensions by un-commenting the corresponding line in your PHP configuration (`php.ini`).
\ No newline at end of file