diff --git a/includes/database/query.inc b/includes/database/query.inc
index 36787001930..ce8dc152ca2 100644
--- a/includes/database/query.inc
+++ b/includes/database/query.inc
@@ -1386,8 +1386,10 @@ function db_xor() {
 /**
  * Returns a new DatabaseCondition, set to the specified conjunction.
  *
- * @param
- *   The conjunction (AND, OR, XOR, etc.) to use on conditions.
+ * @param $conjunction
+ *   The conjunction to use for query conditions. The following conjunctions are
+ *   supported: AND, OR, XOR, IN, NOT IN, BETWEEN, IS NULL, IS NOT NULL,
+ *   LIKE.
  * @return DatabaseCondition
  */
 function db_condition($conjunction) {