diff --git a/doc/conf.py b/doc/conf.py
index a71b876..9c41c10 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -69,8 +69,8 @@
 # -- Options for extlinks extension ------------------------------------------
 
 extlinks = {
-    'arxiv': ('https://arxiv.org/abs/%s', 'arXiv:'),
-    'doi': ('https://doi.org/%s', 'doi:')
+    'arxiv': ('https://arxiv.org/abs/%s', 'arXiv:%s'),
+    'doi': ('https://doi.org/%s', 'doi:%s')
 }