diff --git a/README.md b/README.md
index c053a7f..38eec6a 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,8 @@ optional arguments:
                         Specify alternate bind address [default: all interfaces]
   --directory DIRECTORY, -d DIRECTORY
                         Specify alternative directory [default:current directory]
-  --css_file CSS_FILE   css-file-path; its content will be written to the <style> element
+  --css_file CSS_FILE   css-file-path whose content will be written to the <style> element. Can be "none"; do not
+                            use any css
   --live_md_rr LIVE_MD_RR, -l LIVE_MD_RR
                         Continuous refresh rate of MD page, in ms. Respects cache
 ```
@@ -52,6 +53,7 @@ optional arguments:
   --encode_local_images, -e
                         in HTML, embed base64-encoded data of local images linked to in your markdown; remove
                         dependency on presence of external local images
-  --css_file CSS_FILE   css-file-path; its content will be written to the <style> element
+  --css_file CSS_FILE   css-file-path whose content will be written to the <style> element. Can be "none"; do not
+                            use any css
 ```
 ![](<./scrot.png>)