diff --git a/docs/WritingTests.asciidoc b/docs/WritingTests.asciidoc
index bb2dab1787f..8c7aad12f48 100644
--- a/docs/WritingTests.asciidoc
+++ b/docs/WritingTests.asciidoc
@@ -176,11 +176,11 @@ def run(self):
     assert_screen('openqa-search-results')
 
     # import further Perl-based libraries (besides `testapi`)
-    perl.require("x11utils") 
+    perl.require('x11utils')
 
     # use imported Perl-based libraries; call Perl function that would be called via "named arguments" in Perl
     # note: In Perl the call would have been: x11_start_program('flatpak run com.obsproject.Studio', target_match => 'obsproject-wizard')
-    perl.x11utils.x11_start_program("flatpak run com.obsproject.Studio", "target_match", "obsproject-wizard") 
+    perl.x11utils.x11_start_program('flatpak run com.obsproject.Studio', 'target_match', 'obsproject-wizard')
 
 def switch_to_root_console():
     send_key('ctrl-alt-f3')