diff --git a/c-programming/reverse-ramdisk.c b/c-programming/reverse-ramdisk.c
index 8a2c512..ba78179 100644
--- a/c-programming/reverse-ramdisk.c
+++ b/c-programming/reverse-ramdisk.c
@@ -28,6 +28,11 @@ typedef struct {
 TempFile* temp_files = NULL;
 size_t num_temp_files = 0;
 
+int tf_alloc(size_t n, size_t type_size);
+int tf_free(int ID);
+int tf_write(int ID, size_t offset, void* data, size_t data_size);
+int tf_read(int ID, size_t offset, void* dest, size_t data_size);
+
 #ifdef DEBUG
 # define line_fail(x) do { \
 	printf("failed on line %d\n", __LINE__ + x); \