diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0df5758..c048c37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 * 2.0.next in progress
   * Fix #328 by adding `:distinct` as special syntax, affecting an expression.
+  * Address #327 by changing "unknown clause" error to including mention of "nil values" (which are also illegal).
   * Support PostgreSQL's `&&` array operator.
   * Clarify how to `SELECT` a function expression (in **Getting Started**).