diff --git a/doc/administration/config-cheat-sheet.en-us.md b/doc/administration/config-cheat-sheet.en-us.md
index 5bf5d6fb..fdd1235f 100644
--- a/doc/administration/config-cheat-sheet.en-us.md
+++ b/doc/administration/config-cheat-sheet.en-us.md
@@ -276,7 +276,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
   trailing whitespace to paragraphs is not necessary to force a line break.
 - `CUSTOM_URL_SCHEMES`: Use a comma separated list (ftp,git,svn) to indicate additional
   URL hyperlinks to be rendered in Markdown. URLs beginning in http and https are
-  always displayed
+  always displayed. If this entry is empty, all URL schemes are allowed
 - `FILE_EXTENSIONS`: **.md,.markdown,.mdown,.mkd,.livemd**: List of file extensions that should be rendered/edited as Markdown. Separate the extensions with a comma. To render files without any extension as markdown, just put a comma.
 - `ENABLE_MATH`: **true**: Enables detection of `\(...\)`, `\[...\]`, `$...$` and `$$...$$` blocks as math blocks.