diff --git a/saveload.h b/saveload.h
--- a/saveload.h
+++ b/saveload.h
@@ -126,6 +126,13 @@ enum VarTypes {
 	SLE_INT  = SLE_INT32,
 	SLE_STRB = SLE_STRINGBUF,
 	SLE_STRQ = SLE_STRINGQUOTE,
+
+	/* 8 bytes allocated for a maximum of 8 flags
+	 * Flags directing saving/loading of a variable */
+	SLF_SAVE_NO      = 1 <<  8, ///< do not save with savegame, basically player-based
+	SLF_CONFIG_NO    = 1 <<  9, ///< do not save to config file
+	SLF_NETWORK_NO   = 1 << 10, ///< do not synchronize over network (but it is saved if SSF_SAVE_NO is not set)
+	/* 5 more possible flags */
 };
 
 typedef uint32 VarType;