diff --git a/README.md b/README.md
index e77c221..b520bb6 100644
--- a/README.md
+++ b/README.md
@@ -49,13 +49,9 @@ magick convert main-1.png -gravity North -crop 100%x20% main.png
 
 ## LuaLaTeX
 
-WIP
-
 ```sh
 texrocks install lualatex-fmt
-luatex examples/tex/latex/main.tex
-pdftocairo -png main.pdf
-magick convert main-1.png -gravity North -crop 100%x20% main.png
+lualatex examples/tex/latex/main.tex
 ```
 
 ## texdoc
@@ -95,6 +91,15 @@ Would you like to search online? (y/N) y
 texrocks install l3build
 ```
 
+## texluap
+
+Sometimes you need a REPL to debug luatex. you can refer
+[texluap](https://github.com/wakatime/prompt-style.lua#luatex):
+
+```sh
+texrocks install prompt-style
+```
+
 ## Credit
 
 - [rocks.nvim](https://github.com/nvim-neorocks/rocks.nvim)
diff --git a/examples/tex/latex/main.tex b/examples/tex/latex/main.tex
new file mode 100644
index 0000000..5869473
--- /dev/null
+++ b/examples/tex/latex/main.tex
@@ -0,0 +1,7 @@
+\documentclass{article}
+\title{main}
+\begin{document}
+
+Hello, \LaTeX!
+
+\end{document}
diff --git a/lua/texrocks/cmd.lua b/lua/texrocks/cmd.lua
index 56913b8..450adc8 100644
--- a/lua/texrocks/cmd.lua
+++ b/lua/texrocks/cmd.lua
@@ -29,7 +29,7 @@ function M.main()
         return
     end
     if args.rock ~= '' then
-        luarocks.cli { cmd, args.rock }
+        print(table.concat(luarocks.cli { cmd, args.rock }))
     end
     if args.install or args.remove then
         adapter.sync()