diff --git a/doc/xschem_man/install_xschem.html b/doc/xschem_man/install_xschem.html
index f4dadfaf..d0cf6ab7 100644
--- a/doc/xschem_man/install_xschem.html
+++ b/doc/xschem_man/install_xschem.html
@@ -65,7 +65,7 @@ p{padding: 15px  30px 10px;}
  Tck/Tk versions may vary on different systems, 8.4, 8.5, 8.6 versions are all good.
  </p>
  <pre class="code">
-  libX11-6              libx11-dev
+  libx11-6              libx11-dev
   libxrender1           libxrender-dev
   libxcb1               libx11-xcb-dev        
   libcairo2             libcairo2-dev