diff --git a/.gitignore b/.gitignore
index 2b751a3..0069b2a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,15 @@
-*.o
-*.kate-swp
+# Binaries
 httpdirfs
+sonicfs
+
+# Intermediates
+*.o
 .depend
-doc/html
+
+# Documentation
+doc
+
+# Editor related
 .vscode
 httpdirfs.code-workspace
+*.kate-swp
\ No newline at end of file
diff --git a/Doxyfile b/Doxyfile
index 56a01a6..44b100e 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -901,7 +901,7 @@ EXCLUDE_PATTERNS       =
 # Note that the wildcards are matched against the file with absolute path, so to
 # exclude all test directories use the pattern */test/*
 
-EXCLUDE_SYMBOLS        = 
+EXCLUDE_SYMBOLS        = CALLOC exit_failure
 
 # The EXAMPLE_PATH tag can be used to specify one or more files or directories
 # that contain example code fragments that are included (see the \include
diff --git a/src/fuse_local.c b/src/fuse_local.c
index a427dac..0948897 100644
--- a/src/fuse_local.c
+++ b/src/fuse_local.c
@@ -113,14 +113,23 @@ static int fs_open(const char *path, struct fuse_file_info *fi)
     return 0;
 }
 
-/** \brief read the directory indicated by the path*/
+/**
+ * \brief read the directory indicated by the path
+ * \note
+ *  - releasedir() is not implemented, because I don't see why anybody want
+ * the LinkTables to be evicted from the memory during the runtime of this
+ * program. If you want to evict LinkTables, just unmount the filesystem.
+ *  - There is no real need to associate the LinkTable with the fi of each
+ * directory data structure. If you want a deep level directory, you need to
+ * generate the LinkTables for previous level directories. We might
+ * as well maintain our own tree structure.
+ */
 static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t dir_add,
                       off_t offset, struct fuse_file_info *fi)
 {
     (void) offset;
     (void) fi;
 
-    Link *link;
     LinkTable *linktbl;
 
     if (!strcmp(path, "/")) {
@@ -136,7 +145,7 @@ static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t dir_add,
     dir_add(buf, ".", NULL, 0);
     dir_add(buf, "..", NULL, 0);
     for (int i = 1; i < linktbl->num; i++) {
-        link = linktbl->links[i];
+        Link *link = linktbl->links[i];
         if (link->type != LINK_INVALID) {
             dir_add(buf, link->linkname, NULL, 0);
         }
diff --git a/src/util.c b/src/util.c
index f2141bd..2ee2046 100644
--- a/src/util.c
+++ b/src/util.c
@@ -86,8 +86,6 @@ void Config_init(void)
     CONFIG.max_segbc = DEFAULT_MAX_SEGBC;
 
     /*-------------- Sonic related -------------*/
-    CONFIG.sonic_mode = 0;
-
     CONFIG.sonic_username = NULL;
 
     CONFIG.sonic_password = NULL;
diff --git a/src/util.h b/src/util.h
index d7c7c15..9b15cc3 100644
--- a/src/util.h
+++ b/src/util.h
@@ -26,11 +26,6 @@
  */
 #define DEFAULT_USER_AGENT "HTTPDirFS-" VERSION
 
-
-
-
-
-
 /**
  * \brief configuration data structure
  * \note The opening curly bracket should be at line 39, so the code belong