1 files changed, 4 insertions, 0 deletions

diff --git a/src/phenotype.h b/src/phenotype.h
index 0eafb78..27173e2 100644
--- a/src/phenotype.h
+++ b/src/phenotype.h
@@ -1,6 +1,7 @@
 #ifndef GENETIC_PHENOTYPE_H
 #define GENETIC_PHENOTYPE_H
 
+#include <bu/stream.h>
 #include <bu/string.h>
 #include <bu/hash.h>
 #include <bu/variant.h>
@@ -33,6 +34,9 @@ namespace Genetic
 
                 virtual Bu::String toString()=0;
 
+                virtual void write( Bu::Stream &rStream ) {};
+                virtual void read( Bu::Stream &rStream ) {};
+
                 bool hasProperty( const Bu::String &sKey ) const;
                 Bu::Variant getProperty( const Bu::String &sKey ) const;
                 void setProperty( const Bu::String &sKey, Bu::Variant vValue );