diff --git a/LICENSES-OTHER-COMPONENTS.md b/LICENSES-OTHER-COMPONENTS.md
index b29a22aa24..45c513cc5b 100644
--- a/LICENSES-OTHER-COMPONENTS.md
+++ b/LICENSES-OTHER-COMPONENTS.md
@@ -61,7 +61,7 @@
 ### Bison
 
 * https://www.gnu.org/software/bison/
-* only used to generate code, not part of the distribution
+* only used to generate code, not part of the distribution; for details about using Bison in this way see http://www.gnu.org/software/bison/manual/bison.html#Conditions
 * parts generated use see https://github.com/arangodb/arangodb/blob/devel/arangod/Aql/grammar.cpp#L20
 
 ### Flex