diff --git a/GNUmakefile b/GNUmakefile
index de50af5f..569b32fc 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,9 +1,10 @@
 # can't use -fno-rtti yet because it causes problems with exception handling in GCC 2.95.2
 CXXFLAGS = -g
-# Uncomment the next two lines to do a release build.
+# Uncomment the following two lines to do a release build.
 # Note that you must define NDEBUG for your own application if you define it for Crypto++.
-# Also, make sure you run the validation tests and test your own program thoroughly
+# Make sure you run the validation tests and test your own program thoroughly
 # after turning on -O2. The GCC optimizer may have bugs that cause it to generate incorrect code.
+# Try removing -fdata-sections if you get "undefined external reference" errors.
 # CXXFLAGS = -O2 -DNDEBUG -ffunction-sections -fdata-sections
 # LDFLAGS = -Wl,--gc-sections
 ARFLAGS = -cr	# ar needs the dash on OpenBSD