Examples: Comments to guide people unfamiliar with the librairies used.

examples/sdl_opengl2_example/imgui_impl_sdl.cpp

@@ -1,5 +1,6 @@
 // ImGui SDL2 binding with OpenGL
 // In this binding, ImTextureID is used to store an OpenGL 'GLuint' texture identifier. Read the FAQ about ImTextureID in imgui.cpp.
+// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // *DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL*
 // This is mostly provided as a reference to learn how ImGui integration works, because it is easier to read.

examples/sdl_opengl2_example/imgui_impl_sdl.h

@@ -1,5 +1,6 @@
 // ImGui SDL2 binding with OpenGL
 // In this binding, ImTextureID is used to store an OpenGL 'GLuint' texture identifier. Read the FAQ about ImTextureID in imgui.cpp.
+// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/sdl_opengl2_example/main.cpp

@@ -1,5 +1,6 @@
 // ImGui - standalone example application for SDL2 + OpenGL
 // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
+// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 #include <imgui.h>
 #include "imgui_impl_sdl.h"