1 files changed, 1 insertions, 1 deletions
diff --git a/compton.c b/compton.c
index 539f8d201..a2fbee265 100644
--- a/compton.c
+++ b/compton.c
@@ -4136,7 +4136,7 @@ usage(void) {
     "--glx-no-stencil\n"
     "  Avoid using stencil buffer under GLX backend. Might cause issues\n"
     "  when rendering transparent content, may have a positive or\n"
-    "  negative effect on performance.\n"
+    "  negative effect on performance. (My test shows a 10% slowdown.)\n"
 #undef WARNING
 #ifndef CONFIG_DBUS
 #define WARNING WARNING_DISABLED