diff --git a/SWIG/Lib/swig.swg b/SWIG/Lib/swig.swg
index c94d6d346..a69e54621 100644
--- a/SWIG/Lib/swig.swg
+++ b/SWIG/Lib/swig.swg
@@ -71,6 +71,10 @@
 /* Warnings */
 #define %warnfilter(...) %feature("warnfilter",`__VA_ARGS__`)
 
+/* Contract support - Experimental and undocumented */
+
+#define %contract    %feature("contract")
+
 /* Default handling of certain overloaded operators */
 
 #ifdef __cplusplus