diff --git a/docs/api/dt/prod.rst b/docs/api/dt/prod.rst
index 329bc319d9..c1febea701 100644
--- a/docs/api/dt/prod.rst
+++ b/docs/api/dt/prod.rst
@@ -15,7 +15,7 @@
     cols: FExpr
         Input columns.
 
-    return: FExpr
+    return: Expr
         f-expression having one row, and the same names and number of columns
         as in `cols`. The column stypes are `int64` for
         boolean and integer columns, `float32` for `float32` columns