Revision 3163 added the following formats for OpenGL ES:

SDL_PIXELFORMAT_ABGR4444, SDL_PIXELFORMAT_ABGR1555, SDL_PIXELFORMAT_BGR565

README.iphoneos

@@ -55,7 +55,7 @@ Notes -- OpenGL ES
 
 Your SDL application for iPhone uses OpenGL ES for video by default.
 
-OpenGL ES for iPhone supports two display pixel formats, RGBA8 and RGB565, which provide a 32 bit and 16 bit color buffer respectively.  By default, the implementation uses RGB565, but you may use RGBA8 by setting each color component to 8 bits in SDL_GL_SetAttribute.
+OpenGL ES for iPhone supports several display pixel formats, such as RGBA8 and RGB565, which provide a 32 bit and 16 bit color buffer respectively.  By default, the implementation uses RGB565, but you may use RGBA8 by setting each color component to 8 bits in SDL_GL_SetAttribute.
 
 If your application doesn't use OpenGL's depth buffer, you may find significant performance improvement by setting SDL_GL_DEPTH_SIZE to 0.