added new header
diff --git a/theta/CMakeLists.txt b/theta/CMakeLists.txt
index ae02e79..69af9db 100644
--- a/theta/CMakeLists.txt
+++ b/theta/CMakeLists.txt
@@ -36,6 +36,7 @@
 list(APPEND theta_HEADERS "include/theta_sketch.hpp;include/theta_union.hpp;include/theta_intersection.hpp")
 list(APPEND theta_HEADERS "include/theta_a_not_b.hpp;include/binomial_bounds.hpp;include/theta_sketch_impl.hpp")
 list(APPEND theta_HEADERS "include/theta_union_impl.hpp;include/theta_intersection_impl.hpp;include/theta_a_not_b_impl.hpp")
+list(APPEND theta_HEADERS "include/conditional_back_inserter.hpp")
 
 install(TARGETS theta
   EXPORT ${PROJECT_NAME}
@@ -55,4 +56,5 @@
     ${CMAKE_CURRENT_SOURCE_DIR}/include/theta_union_impl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/include/theta_intersection_impl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/include/theta_a_not_b_impl.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/conditional_back_inserter.hpp
 )