diff --git a/lsm/Makefile b/lsm/Makefile
new file mode 100644
index 0000000..5352623
--- /dev/null
+++ b/lsm/Makefile
@@ -0,0 +1,95 @@
+# https://spin.atomicobject.com/2016/08/26/makefile-c-projects/ was a great
+# base for this Makefile
+
+-include config.mk
+
+LIB := $(BUILD_DIR)/$(LIB_FILENAME)
+
+SRCS != find '$(SRC_DIR)' -iname '*.c'
+SRCS_H != find $(INC_DIRS) -iname '*.h'
+SRCS_H_INTERNAL != find $(SRC_DIR) -iname '*.h'
+SRCS_TEST != find '$(TEST_DIR)' -iname '*.c'
+
+OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
+OBJS_TEST := $(SRCS_TEST:%=$(BUILD_DIR)/%.o)
+DEPS := $(SRCS:%=$(BUILD_DIR)/%.d) $(SRCS_TEST:%=$(BUILD_DIR)/%.d)
+
+BINS_TEST := $(OBJS_TEST:%.c.o=%)
+TARGETS_TEST := $(BINS_TEST:%=test-%)
+TARGETS_MEM_TEST := $(BINS_TEST:%=test-mem-%)
+
+_CFLAGS := $(addprefix -I,$(INC_DIRS)) $(CFLAGS) -Wall -Wextra
+
+.PHONY: all
+all: lib
+
+
+# =====COMPILATION=====
+# Utility used by the CI to lint
+.PHONY: objs
+objs: $(OBJS)
+
+.PHONY: lib
+lib: $(LIB)
+$(LIB): $(OBJS)
+	ar -rcs $@ $(OBJS)
+
+$(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
+	mkdir -p $(dir $@)
+	$(CC) -c $(_CFLAGS) $< -o $@
+
+
+# =====TESTING=====
+.PHONY: test
+test: $(TARGETS_TEST)
+
+.PHONY: test-mem
+test-mem: $(TARGETS_MEM_TEST)
+
+.PHONY: $(TARGETS_TEST)
+$(TARGETS_TEST): test-%: %
+	./$^
+
+.PHONY: $(TARGETS_MEM_TEST)
+$(TARGETS_MEM_TEST): test-mem-%: %
+	valgrind --tool=memcheck --error-exitcode=1 --track-origins=yes --leak-check=full ./$^
+
+.PHONY: build-test
+build-test: $(BINS_TEST)
+
+$(BINS_TEST): %: %.c.o $(LIB)
+	$(CC) \
+		$^ -o $@
+
+# Along with the include directory, each test includes $(TEST_DIR) (which
+# contains the acutest.h header file), and the src directory of the module it's
+# testing. This allows tests to access internal methods, which aren't publicly
+# exposed.
+$(BUILD_DIR)/$(TEST_DIR)/%.c.o: $(TEST_DIR)/%.c
+	mkdir -p $(dir $@)
+	$(CC) $(_CFLAGS) -I$(TEST_DIR) \
+		-I$(dir $(@:$(BUILD_DIR)/$(TEST_DIR)/%=$(SRC_DIR)/%)) \
+		-c $< -o $@
+
+# =====MAINTENANCE=====
+.PHONY: lint
+lint:
+	clang-format -n --Werror $(SRCS) $(SRCS_H) $(SRCS_H_INTERNAL)
+
+.PHONY: fmt
+fmt:
+	clang-format -i $(SRCS) $(SRCS_H) $(SRCS_H_INTERNAL)
+
+.PHONY: clean
+clean:
+	rm -rf $(BUILD_DIR)
+
+
+.PHONY: bear
+bear: clean
+	bear -- make
+	bear --append -- make build-test
+
+
+# Make make aware of the .d files
+-include $(DEPS)
diff --git a/lsm/config.mk b/lsm/config.mk
new file mode 100644
index 0000000..c453c6a
--- /dev/null
+++ b/lsm/config.mk
@@ -0,0 +1,13 @@
+LIB_FILENAME = liblsm.a
+
+BUILD_DIR = build
+SRC_DIR = src
+TEST_DIR = test
+INC_DIRS = 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
+#  object file is also recompiled if only a header is changed.
+# -MP: generate a dummy target for every header file (according to the  docs it
+#  prevents some errors when removing header files)
+CFLAGS = -MMD -MP -g
diff --git a/lsm/include/lsm.h b/lsm/include/lsm.h
new file mode 100644
index 0000000..838e8e9
--- /dev/null
+++ b/lsm/include/lsm.h
@@ -0,0 +1,47 @@
+#include <stdint.h>
+
+/**
+ * Represents a string (or really any kind of data) with a known length. Data
+ * with length 8 or less is stored inside the pointer instead of needlessly
+ * allocating additional memory.
+ */
+typedef struct lsm_string {
+  uint64_t len;
+  union {
+    void *ptr;
+    char val[8];
+  } str;
+} lsm_string;
+
+typedef enum lsm_attr_type {
+  lsm_attr_type_entry_type = 0
+} lsm_attr_type;
+
+typedef struct lsm_attr {
+  lsm_attr_type type;
+  lsm_string str;
+} lsm_attr;
+
+/**
+ * Represents a collection of metadata objects
+ */
+typedef struct lsm_attr_list {
+  uint64_t count;
+  lsm_attr *items;
+} lsm_attr_list;
+
+/**
+ * An entry inside 
+ */
+typedef struct lsm_entry {
+  lsm_string key;
+  lsm_attr_list attrs;
+  lsm_string data;
+} lsm_entry;
+
+/**
+ * A store of entries, which manages its data both in-memory and on disk.
+ */
+typedef struct lsm_store {
+
+} lsm_store;
diff --git a/src/main.c b/src/main.c
index fa9d95e..f32f83f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,7 +27,7 @@ int main() {
 
   int port = atoi(port_str);
 
-  if (port <= 0 || port >= 2 << 16) {
+  if (port <= 0 || port >= 1 << 16) {
     critical(1, "Invalid TCP port %s", port_str);
   }