1 files changed, 2 insertions, 1 deletions
diff --git a/emcc b/emcc
index ece1e4c5..33fb9147 100755
--- a/emcc
+++ b/emcc
@@ -160,7 +160,8 @@ Options that are modified or new in %s include:
                            output.
 
   -O3                      As -O2, plus additional optimizations that can
-                           take a significant amount of compilation time.
+                           take a significant amount of compilation time and/or
+                           are relatively new.
 
                            For tips on optimizing your code, see
                            https://github.com/kripken/emscripten/wiki/Optimizing-Code