diff --git a/gnu/services.scm b/gnu/services.scm
index 03112f7515..4020fd37e0 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -38,6 +38,8 @@
   #:use-module (ice-9 match)
   #:export (service-extension
             service-extension?
+            service-extension-target
+            service-extension-compute
 
             service-type
             service-type?