diff --git a/docs/language/core.rst b/docs/language/core.rst
index deaf16b..1b31dc7 100644
--- a/docs/language/core.rst
+++ b/docs/language/core.rst
@@ -9,7 +9,7 @@ Core Functions
 .. _is-coll-fn:
 
 coll?
-----
+-----
 
 .. versionadded:: 0.9.13