diff -r 07e695665fc5 -r bf0b6a2c0737 data/dictionary.xml
--- a/data/dictionary.xml	Fri Aug 16 16:02:38 2013 +0200
+++ b/data/dictionary.xml	Fri Aug 16 16:16:25 2013 +0200
@@ -1465,24 +1465,48 @@
 	</concept>
 	<concept>
 		<term abbreviation="GNU" completeForm="GNU's Not Unix!" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a Unix-like operating system that is free software and is upward-compatible with Unix;
+				the GNU Project was initially announced in September 1983 by Richard Stallman;
+				nowadays is mostly used in combination with Linux kernel and called GNU/Linux
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>
 		<term abbreviation="GNU GPL" completeForm="GNU General Public License" language="en"/>
 		<term abbreviation="GPL" completeForm="General Public License" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a free software and copyleft license which is used by many free software packages
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>
 		<term abbreviation="GNU FDL" completeForm="GNU Free Documentation License" language="en"/>
 		<term abbreviation="FDL" completeForm="Free Documentation License" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				whereas GNU GPL is free and copyleft license for software,
+				the GNU FDL is similar license designed for documentaion – books, articles, drawings etc.
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>
 		<term abbreviation="FS" completeForm="free software" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a category of software which respects user's freedoms – user of such software has the four essential freedoms:
+					0) The freedom to run the program, for any purpose.
+					1) The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.
+					2) The freedom to redistribute copies so you can help your neighbor.
+					3) The freedom to distribute copies of your modified versions to others. By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.;
+				the term „Free software“ was defined by Richard Stallman
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>