diff --git a/compton.sample.conf b/compton.sample.conf
index ca655dc..814e2b7 100644
--- a/compton.sample.conf
+++ b/compton.sample.conf
@@ -71,7 +71,6 @@ invert-color-include = [ ];
 # glx-no-stencil = true;
 # glx-no-rebind-pixmap = true;
 glx-swap-method = "undefined";
-# xrender-sync = true;
 # xrender-sync-fence = true;
 
 # Window type settings
diff --git a/src/options.c b/src/options.c
index d570f94..f913e68 100644
--- a/src/options.c
+++ b/src/options.c
@@ -315,14 +315,6 @@ static void usage(int ret) {
 	    "  but safer (6 is still faster than 0). -1 means auto-detect using\n"
 	    "  GLX_EXT_buffer_age, supported by some drivers. \n"
 	    "\n"
-	    "--glx-use-gpushader4\n"
-	    "  GLX backend: Use GL_EXT_gpu_shader4 for some optimization on blur\n"
-	    "  GLSL code. My tests on GTX 670 show no noticeable effect.\n"
-	    "\n"
-	    "--xrender-sync\n"
-	    "  Attempt to synchronize client applications' draw calls with XSync(),\n"
-	    "  used on GLX backend to ensure up-to-date window content is painted.\n"
-	    "\n"
 	    "--xrender-sync-fence\n"
 	    "  Additionally use X Sync fence to sync clients' draw calls. Needed\n"
 	    "  on nvidia-drivers with GLX backend for some users.\n"