diff --git a/doc/routing_functions.md b/doc/isoline_functions.md
similarity index 96%
rename from doc/routing_functions.md
rename to doc/isoline_functions.md
index 74c074f..aab92ca 100644
--- a/doc/routing_functions.md
+++ b/doc/isoline_functions.md
@@ -1,11 +1,6 @@
+# Isoline functions
 
-# Routing functions
-
-The following routing functions are available.
-
-## Isolines
-
-This function provides an isolines generator service based on time or distance.
+The following functions provide an isolines generator service based on time or distance.
 
 ### cdb_isodistance(_source geometry, mode text, range integer[], options text[]_)