diff -r 7977c1bdba1f -r c9fece435aa2 src/Configuration.h
--- a/src/Configuration.h	Tue Feb 05 00:06:44 2019 +0100
+++ b/src/Configuration.h	Tue Feb 05 12:14:58 2019 +0100
@@ -56,6 +56,7 @@
 	/**
 	 * Variable definitions for this relation.
 	 * Can be used as a safe way for passing parameters from the outside environment.
+	 * See also Configuration::definitions (can be overridden by relation's definitions)
 	 */
 	std::vector<DefinitionRecipe> definitions;
 	/**
@@ -67,8 +68,13 @@
 class Configuration {
 public:
 	vector<RelationConfiguration> relationConfigurations;
+	/**
+	 * Global definitions for all relations.
+	 * Can be used as a safe way for passing parameters from the outside environment.
+	 * See also RelationConfiguration::definitions
+	 */
+	std::vector<DefinitionRecipe> definitions;
 
-	// TODO: --define – global definitions (for all relations)?
 	// TODO: --relation … --drop – will execute --for-each, but no output will be generated for this relation
 	// TODO: --create t2 3 a integer b boolean '…guile…' – allow creating new relations? Or allow calling startRelation() and attribute() from Guile?