diff --git a/ssql.scm b/ssql.scm
index a6d259d..ac33c8a 100644
--- a/ssql.scm
+++ b/ssql.scm
@@ -225,6 +225,7 @@
   (avg function)
   (sum function)
   (count function)
+  (coalesce function)
 
   (distinct prefix)
   (all prefix)