diff --git a/README b/README
index 6ae1c57..396f3e9 100644
--- a/README
+++ b/README
@@ -7,9 +7,13 @@ Build
 =====
 In addition to basic C development tools, the following is needed:
 
-* scons
+* scons 2.3.0 or later
 * check
 
 Run scons --help to see the various options for building the library
 Run "scons test" to run the test suite
 
+Note that scons v 2.3.1 or later is recommended, since scons v 2.3.0
+has a bug which prevents shared libraries from re-building properly.
+
+