diff --git a/lexicon.cfg b/lexicon.cfg
index 7895f67..c29357e 100644
--- a/lexicon.cfg
+++ b/lexicon.cfg
@@ -12,6 +12,11 @@ value
 Lexicon Title
 <<<LEXICON_TITLE<<<
 
+# The sidebar image. Constrained to 15-px.
+>>>LOGO_FILENAME>>>
+logo.png
+<<<LOGO_FILENAME<<<
+
 # Sidebar content. Will be read as Lexipython Markdown.
 # The title header won't be displayed but needs to be included for the
 # parsing to validate. Just ignore it.