diff --git a/src/internal_bit.rs b/src/internal_bit.rs
index e69de29..8b13789 100644
--- a/src/internal_bit.rs
+++ b/src/internal_bit.rs
@@ -0,0 +1 @@
+
diff --git a/src/internal_math.rs b/src/internal_math.rs
index e69de29..8b13789 100644
--- a/src/internal_math.rs
+++ b/src/internal_math.rs
@@ -0,0 +1 @@
+
diff --git a/src/internal_queue.rs b/src/internal_queue.rs
index e69de29..8b13789 100644
--- a/src/internal_queue.rs
+++ b/src/internal_queue.rs
@@ -0,0 +1 @@
+
diff --git a/src/internal_scc.rs b/src/internal_scc.rs
index e69de29..8b13789 100644
--- a/src/internal_scc.rs
+++ b/src/internal_scc.rs
@@ -0,0 +1 @@
+
diff --git a/src/internal_type_traits.rs b/src/internal_type_traits.rs
index e69de29..8b13789 100644
--- a/src/internal_type_traits.rs
+++ b/src/internal_type_traits.rs
@@ -0,0 +1 @@
+
diff --git a/src/lib.rs b/src/lib.rs
index ce39049..d501511 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,4 +11,10 @@ mod segtree;
 mod string;
 mod twosat;
 
+pub(crate) mod internal_bit;
+pub(crate) mod internal_math;
+pub(crate) mod internal_queue;
+pub(crate) mod internal_scc;
+pub(crate) mod internal_type_traits;
+
 pub use fenwicktree::FenwickTree;