Update xlsx arg description (xslx -> xlsx)
diff --git a/README.md b/README.md
index b71cc2bca..f480f4fd1 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ optional arguments:
                         path.
   --csv                 Create Comma-Separated Values (CSV) File.
   --xlsx                Create the standard file for the modern Microsoft Excel
-                        spreadsheet (xslx).
+                        spreadsheet (xlsx).
   --site SITE_NAME      Limit analysis to just the listed sites. Add multiple options to
                         specify more than one site.
   --proxy PROXY_URL, -p PROXY_URL
diff --git a/sherlock/sherlock.py b/sherlock/sherlock.py
index a8760f2f9..fb9f52453 100644
--- a/sherlock/sherlock.py
+++ b/sherlock/sherlock.py
@@ -555,7 +555,7 @@ def main():
         action="store_true",
         dest="xlsx",
         default=False,
-        help="Create the standard file for the modern Microsoft Excel spreadsheet (xslx).",
+        help="Create the standard file for the modern Microsoft Excel spreadsheet (xlsx).",
     )
     parser.add_argument(
         "--site",
