diff --git a/genlog.sh b/genlog.sh
index a365b37..727c076 100755
--- a/genlog.sh
+++ b/genlog.sh
@@ -72,6 +72,14 @@ do
     # converting .gmi files in .html
     /usr/local/bin/gmnitohtml < "$gmi_file" > "$tempdir/body.html"
 
+    # trick to support h4 titles
+    lines=$(grep "<h3># .*<\/h3>" "$tempdir/body.html")
+    while read -r line; do
+        fixed_line=${line//<h3># /<h4>}  # replace '<h3># ' by '<h4>'
+        fixed_line=${fixed_line//<\/h3>/<\/h4>}  # replace '</h3>' by '</h4>'
+        sed -i "s~$line~$fixed_line~" "$tempdir/body.html"
+    done <<< "$lines"
+
     # retrieving of the path of the current .gmi file
     file_path="$(dirname "$gmi_file")"
     # retrieving of the filename of the current .gmi file, without its extension
diff --git a/html/header.html b/html/header.html
index 27de878..215f57c 100644
--- a/html/header.html
+++ b/html/header.html
@@ -64,6 +64,10 @@
             content: "### ";
         }
 
+        h4::before {
+            content: "#### ";
+        }
+
         blockquote::before {
             content: "> ";
         }