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diff --git a/README b/README
index 2e9ad5c..39bee7e 100644
--- a/README
+++ b/README
@@ -137,6 +137,9 @@ In particular:
 Compiler Notes
 ==============
 
+The code should be fully portable across architectures and operating
+systems, but compilers may be a problem:
+
 The code has been compiled and run successfully using
 * gcc version 2.95.3 20010125 (prerelease)
 * gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)