diff --git a/README.md b/README.md
index c54d2f7..8e9b925 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Notes:
 * you will need LuaJIT (https://github.com/LuaJIT/LuaJIT.git better 2.1 branch) or precompiled for linux/macOS/windows in https://luapower.com/luajit/download
 * you can use also a C++ compiler for doing preprocessing: gcc (In windows MinGW-W64-builds for example), clang or cl (MSVC) or not use a compiler (experimental nocompiler option) at all. (this repo was done with gcc)
 * update `imgui` folder to the version you desire.
-* edit `generator/generator.bat` (or make a .sh version and please PR) to choose between gcc, clang, cl or nocompiler. Run it with gcc, clang or cl and LuaJIT on your PATH.
+* edit `generator/generator.bat` on windows, or `generator/generator.sh` on linux, to choose between gcc, clang, cl or nocompiler. Run it with gcc, clang or cl and LuaJIT on your PATH.
 * as a result some files are generated: `cimgui.cpp` and `cimgui.h` for compiling and some lua/json files with information about the binding: `definitions.json` with function info, `structs_and_enums.json` with struct and enum info, `impl_definitions.json` with functions from the implementations info. 
 
 # generate binding
diff --git a/generator/generator.sh b/generator/generator.sh
new file mode 100755
index 0000000..d4e05a2
--- /dev/null
+++ b/generator/generator.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/sh
+
+# this script must be executed in this directory
+# all the output goes to generator/output folder
+# .cpp and .h files:
+# cimgui.h and cimgui.cpp with gcc preprocess
+# cimgui_nopreprocess.h and cimgui_nopreprocess.cpp generated without preprocess
+# cimgui_impl.h with implementation function cdefs
+# lua and json files:
+# definitions.lua for function definitions
+# structs_and_enums.lua with struct and enum information-definitions
+# impl_definitions.lua for implementation function definitions
+
+#process  files
+# arg[1] compiler name gcc, clang, cl or nocompiler
+# arg[2..n] name of implementations to generate
+luajit ./generator.lua gcc glfw opengl3 opengl2 sdl