diff --git a/TODO b/TODO
index 16d66e3..cf99a15 100644
--- a/TODO
+++ b/TODO
@@ -31,5 +31,5 @@
 [ ] add multi cursor system
 [ ] add binding to open up a cheatsheet of keybinding, with a
     search feature
-[ ] implement visual "ruler" at column 80
+[x] implement visual "ruler" at column 80
 [ ] show hidden files config and binding
diff --git a/data/core/docview.lua b/data/core/docview.lua
index 73191c2..58a1586 100644
--- a/data/core/docview.lua
+++ b/data/core/docview.lua
@@ -305,6 +305,10 @@ end
 
 function DocView:draw_line_body(idx, x, y)
   local line, col = self.doc:get_selection()
+  local sw = self:get_font():get_width(" ")
+  local w = math.ceil(1 * SCALE)
+  local lh = self:get_line_height()
+  local color = style.guide or style.selection
 
   -- draw selection if it overlaps this line
   local line1, col1, line2, col2 = self.doc:get_selection(true)
@@ -324,6 +328,9 @@ function DocView:draw_line_body(idx, x, y)
     self:draw_line_highlight(x + self.scroll.x, y)
   end
 
+  -- draw ruler
+  renderer.draw_rect(x + config.line_limit * sw, y, sw, lh, color)
+
   -- draw line's text
   self:draw_line_text(idx, x, y)
 
diff --git a/src/main.c b/src/main.c
index d599118..c4a9b45 100644
--- a/src/main.c
+++ b/src/main.c
@@ -65,7 +65,6 @@ int main(int argc, char **argv)
 	init_window_icon();
 	ren_init(window);
 
-
 	lua_State *L = luaL_newstate();
 	luaL_openlibs(L);
 	api_load_libs(L);