diff --git a/lsm/config.mk b/lsm/config.mk
index c453c6a..310b7c4 100644
--- a/lsm/config.mk
+++ b/lsm/config.mk
@@ -3,7 +3,7 @@ LIB_FILENAME = liblsm.a
 BUILD_DIR = build
 SRC_DIR = src
 TEST_DIR = test
-INC_DIRS = include
+INC_DIRS = include src/_include
 
 # -MMD: generate a .d file for every source file. This file can be imported by
 #  make and makes make aware that a header file has been changed, ensuring an
diff --git a/lsm/include/lsm/trie.h b/lsm/include/lsm/trie.h
index c50d1b3..7fd6b5b 100644
--- a/lsm/include/lsm/trie.h
+++ b/lsm/include/lsm/trie.h
@@ -2,6 +2,7 @@
 #define LSM_TRIE
 
 #include "lsm.h"
+#include "lsm/str.h"
 
 /**
  * A struct representing a trie
@@ -22,4 +23,38 @@ lsm_error lsm_trie_init(lsm_trie **ptr);
  */
 void lsm_trie_free(lsm_trie *trie);
 
+/**
+ * Insert a new element into the trie using the specified key.
+ *
+ * @param trie trie to insert into
+ * @param key key to insert data with
+ * @param data data to insert
+ */
+lsm_error lsm_trie_insert(lsm_trie *trie, lsm_str *key, void *data);
+
+/**
+ * Search for an element in the trie.
+ *
+ * @param out where to store data opinter, if present
+ * @param trie trie to search in
+ * @param key key to search with
+ */
+lsm_error lsm_trie_search(void **data, lsm_trie *trie, lsm_str *key);
+
+/**
+ * Remove an element from the trie.
+ *
+ * @param out where to store the removed data pointer, if present.
+ * @param trie trie to remove from
+ * @param key key to remove
+ */
+lsm_error lsm_trie_remove(void **data, lsm_trie *trie, lsm_str *key);
+
+/**
+ * Return the size of a trie
+ *
+ * @param trie trie to return size for
+ */
+uint64_t lsm_trie_size(lsm_trie *trie);
+
 #endif
diff --git a/lsm/src/bt/lsm_bt_internal.h b/lsm/src/_include/lsm/bt_internal.h
similarity index 100%
rename from lsm/src/bt/lsm_bt_internal.h
rename to lsm/src/_include/lsm/bt_internal.h
diff --git a/lsm/src/string/lsm_str_internal.h b/lsm/src/_include/lsm/str_internal.h
similarity index 100%
rename from lsm/src/string/lsm_str_internal.h
rename to lsm/src/_include/lsm/str_internal.h
diff --git a/lsm/src/_include/lsm/trie_internal.h b/lsm/src/_include/lsm/trie_internal.h
new file mode 100644
index 0000000..4fb7037
--- /dev/null
+++ b/lsm/src/_include/lsm/trie_internal.h
@@ -0,0 +1,14 @@
+#ifndef LSM_TRIE_INTERNAL
+#define LSM_TRIE_INTERNAL
+
+#include "lsm/bt_internal.h"
+#include "lsm/str_internal.h"
+#include "lsm/trie.h"
+
+typedef struct lsm_trie_node {
+  lsm_bt bt;
+  lsm_str skip;
+  char c;
+} lsm_trie_node;
+
+#endif
diff --git a/lsm/src/bt/lsm_bt.c b/lsm/src/bt/lsm_bt.c
index d6e8699..da08cbd 100644
--- a/lsm/src/bt/lsm_bt.c
+++ b/lsm/src/bt/lsm_bt.c
@@ -1,6 +1,6 @@
 #include <stdlib.h>
 
-#include "lsm_bt_internal.h"
+#include "lsm/bt_internal.h"
 
 lsm_error lsm_bt_node_init(lsm_bt_node **ptr, const char key, void *data) {
   lsm_bt_node *node = calloc(1, sizeof(lsm_bt_node));
diff --git a/lsm/src/string/lsm_str.c b/lsm/src/str/lsm_str.c
similarity index 96%
rename from lsm/src/string/lsm_str.c
rename to lsm/src/str/lsm_str.c
index 81e8797..38bce13 100644
--- a/lsm/src/string/lsm_str.c
+++ b/lsm/src/str/lsm_str.c
@@ -3,7 +3,7 @@
 #include <string.h>
 
 #include "lsm.h"
-#include "lsm_str_internal.h"
+#include "lsm/str_internal.h"
 
 lsm_error lsm_str_init_zero(lsm_str **ptr) {
   lsm_str *str = calloc(1, sizeof(lsm_str));
diff --git a/lsm/src/trie/lsm_trie.c b/lsm/src/trie/lsm_trie.c
new file mode 100644
index 0000000..568decb
--- /dev/null
+++ b/lsm/src/trie/lsm_trie.c
@@ -0,0 +1 @@
+#include "lsm/trie_internal.h"
diff --git a/lsm/test/bt/bt.c b/lsm/test/bt/bt.c
index f2d2781..1900305 100644
--- a/lsm/test/bt/bt.c
+++ b/lsm/test/bt/bt.c
@@ -1,5 +1,5 @@
 #include "test.h"
-#include "lsm_bt_internal.h"
+#include "lsm/bt_internal.h"
 
 #define BT_INIT() \
   lsm_bt *bt; \