diff -r 00aecef99f14 -r 6dde411ca82c data/dictionary.xml
--- a/data/dictionary.xml	Tue Aug 13 17:11:12 2013 +0200
+++ b/data/dictionary.xml	Tue Aug 13 17:48:22 2013 +0200
@@ -1643,13 +1643,27 @@
 	</concept>
 	<concept>
 		<term abbreviation="API" completeForm="application programming interface" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				specifies interaction between software components;
+				adds an abstraction layer which divides calling code and called code
+				and enables multiple implementations of such API (or SPI) like multiple databases (database drivers), file systems, remote services etc.
+				examples of API: POSIX, OpenGL, JDBC, JMS or JMX
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>
 		<term abbreviation="SPI" completeForm="service provider interface" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a kind of API to be implemented by third party;
+				can be installed as plugin/addon/extension and used by the application over standard interface;
+				examples of SPI: JDBC, JNDI or JAXP
+			</text>
+		</explanation>
 		<tag>computer</tag>
+		<tag>java</tag>
 	</concept>
 	<concept>
 		<term abbreviation="JMX" completeForm="Java management extensions" language="en"/>