--- a/doc/book/intro/concepts.rst	Fri Jan 31 18:01:41 2020 +0100
+++ b/doc/book/intro/concepts.rst	Fri Jan 31 15:12:45 2020 +0100
@@ -277,7 +277,7 @@
 
 * it is not limited to one specific SQL backend (every one of them
   having an idiomatic way to encode triggers), nor to SQL backends at
-  all (think about LDAP or a Subversion repository)
+  all (think about LDAP or a Mercurial repository)
 
 * it is well-coupled to the rest of the framework