diff --git a/README.md b/README.md
index 7602663..b2e6c00 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,16 @@ Keywords that begin with `%` are interpreted as SQL function calls:
 => ["SELECT COUNT(*) FROM foo"]
 ```
 
+Keywords that begin with `?` are interpreted as bindable parameters:
+
+``clj
+(-> (select :id)
+    (from :foo)
+    (where [:= :a :?baz])
+    (sql/format {:baz "BAZ"}))
+=> ["SELECT id FROM foo WHERE a = ?" "BAZ"]
+```
+
 There are helper functions and data literals for SQL function calls, field qualifiers, raw SQL fragments, and named input parameters:
 
 ```clj
diff --git a/src/honeysql/format.clj b/src/honeysql/format.clj
index 1420826..227fb3b 100644
--- a/src/honeysql/format.clj
+++ b/src/honeysql/format.clj
@@ -1,6 +1,6 @@
 (ns honeysql.format
   (:refer-clojure :exclude [format])
-  (:require [honeysql.types :refer [call raw param-name]]
+  (:require [honeysql.types :refer [call raw param param-name]]
             [clojure.string :as string])
   (:import [honeysql.types SqlCall SqlRaw SqlParam]))
 
@@ -155,9 +155,10 @@
 (extend-protocol ToSql
   clojure.lang.Keyword
   (-to-sql [x] (let [s ^String (name x)]
-                 (if (= \% (.charAt s 0))
-                   (let [call-args (string/split (subs s 1) #"\." 2)]
-                     (to-sql (apply call (map keyword call-args))))
+                 (condp = (.charAt s 0)
+                   \% (let [call-args (string/split (subs s 1) #"\." 2)]
+                        (to-sql (apply call (map keyword call-args))))
+                   \? (to-sql (param (keyword (subs s 1))))
                    (-> s (string/replace "-" "_")))))
   clojure.lang.Symbol
   (-to-sql [x] (-> x name (string/replace "-" "_")))
diff --git a/test/honeysql/core_test.clj b/test/honeysql/core_test.clj
index edd7da4..362d4ac 100644
--- a/test/honeysql/core_test.clj
+++ b/test/honeysql/core_test.clj
@@ -16,7 +16,7 @@
                (left-join [:clod :c] [:= :f.a :c.d])
                (right-join :bock [:= :bock.z :c.e])
                (where [:or
-                       [:and [:= :f.a "bort"] [:not= :b.baz (sql/param :param1)]]
+                       [:and [:= :f.a "bort"] [:not= :b.baz :?param1]]
                        [:< 1 2 3]
                        [:in :f.e [1 (sql/param :param2) 3]]
                        [:between :f.e 10 20]])
@@ -35,7 +35,7 @@
             :left-join [[:clod :c] [:= :f.a :c.d]]
             :right-join [:bock [:= :bock.z :c.e]]
             :where [:or
-                    [:and [:= :f.a "bort"] [:not= :b.baz (sql/param :param1)]]
+                    [:and [:= :f.a "bort"] [:not= :b.baz :?param1]]
                     [:< 1 2 3]
                     [:in :f.e [1 (sql/param :param2) 3]]
                     [:between :f.e 10 20]]