diff --git a/README.md b/README.md
index 47d58bc..f6f8fb1 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,7 @@ where: {
   aisle_id: {not: [25, 30]},  # not in
   user_ids: {all: [1, 3]},    # all elements in array
   category: /frozen .+/,      # regexp
+  store_id: {_exists: true},  # exists [master]
   _or: [{in_stock: true}, {backordered: true}],
   _and: [{in_stock: true}, {backordered: true}],
   _not: {store_id: 1}         # negate a condition
diff --git a/lib/searchkick/query.rb b/lib/searchkick/query.rb
index 44812aa..621b038 100644
--- a/lib/searchkick/query.rb
+++ b/lib/searchkick/query.rb
@@ -945,6 +945,8 @@ module Searchkick
                 end
               when :in
                 filters << term_filters(field, op_value)
+              when :_exists
+                filters << {exists: {field: field}}
               else
                 range_query =
                   case op
diff --git a/test/where_test.rb b/test/where_test.rb
index 15c0cbc..b40ff96 100644
--- a/test/where_test.rb
+++ b/test/where_test.rb
@@ -67,7 +67,11 @@ class WhereTest < Minitest::Test
     assert_search "product", ["Product B", "Product C"], where: {user_ids: {not: [2], in: [1, 3]}}
     assert_search "product", ["Product B", "Product C"], where: {user_ids: {_not: [2], in: [1, 3]}}
 
-    # not / exists
+    # exists
+    assert_search "product", ["Product A", "Product B", "Product C"], where: {user_ids: {_exists: true}}
+    assert_search "product", ["Product A", "Product B", "Product C", "Product D"], where: {store_id: {_exists: true}}
+
+    # not
     assert_search "product", ["Product D"], where: {user_ids: nil}
     assert_search "product", ["Product A", "Product B", "Product C"], where: {user_ids: {not: nil}}
     assert_search "product", ["Product A", "Product B", "Product C"], where: {user_ids: {_not: nil}}
--
libgit2 0.21.0