diff --git a/lib/graphics.c b/lib/graphics.c
index 71196ddb..2f2b9614 100644
--- a/lib/graphics.c
+++ b/lib/graphics.c
@@ -1,4 +1,5 @@
-/* This file is part of ToaruOS and is released under the terms
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
  * of the NCSA / University of Illinois License - see LICENSE.md
  * Copyright (C) 2012-2018 K. Lange
  *
diff --git a/lib/kbd.c b/lib/kbd.c
index de0d355c..2c7b1428 100644
--- a/lib/kbd.c
+++ b/lib/kbd.c
@@ -1,4 +1,4 @@
-/* vim: ts=4 sw=4 noexpandtab
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
  * This file is part of ToaruOS and is released under the terms
  * of the NCSA / University of Illinois License - see LICENSE.md
  * Copyright (C) 2012-2018 K. Lange
diff --git a/lib/pex.c b/lib/pex.c
index e7232f6b..dd0f526c 100644
--- a/lib/pex.c
+++ b/lib/pex.c
@@ -1,6 +1,12 @@
-/* This file is part of ToaruOS and is released under the terms
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
  * of the NCSA / University of Illinois License - see LICENSE.md
  * Copyright (C) 2014-2018 K. Lange
+ *
+ * pex - Packet EXchange client library
+ *
+ * Provides a friendly interface to the "Packet Exchange"
+ * functionality provided by the packetfs kernel module.
  */
 #include <alloca.h>
 #include <assert.h>
diff --git a/lib/sdf.c b/lib/sdf.c
index 7211819e..c5af6e1c 100644
--- a/lib/sdf.c
+++ b/lib/sdf.c
@@ -1,6 +1,9 @@
-/* vim: ts=4 sw=4 noexpandtab
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
+ * of the NCSA / University of Illinois License - see LICENSE.md
+ * Copyright (C) 2018 K. Lange
  *
- * Signed Distance Field Text Library
+ * Signed Distance Field text rasterization library
  */
 
 #include <stdio.h>
diff --git a/lib/textregion.c b/lib/textregion.c
index a49c6da9..be08db3e 100644
--- a/lib/textregion.c
+++ b/lib/textregion.c
@@ -1,9 +1,10 @@
-/* vim: ts=4 sw=4 noexpandtab
- *
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
  * This file is part of ToaruOS and is released under the terms
  * of the NCSA / University of Illinois License - see LICENSE.md
  * Copyright (C) 2018 K. Lange
  *
+ * TODO: This is a work in progress
+ *
  * Port of the original ToaruOS Python text_region library to C.
  *
  * Allows for the display of rich text with multiple varied formats,
diff --git a/lib/yutani.c b/lib/yutani.c
index 417d2cb4..4f0ad061 100644
--- a/lib/yutani.c
+++ b/lib/yutani.c
@@ -1,6 +1,11 @@
-/* This file is part of ToaruOS and is released under the terms
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
  * of the NCSA / University of Illinois License - see LICENSE.md
  * Copyright (C) 2014-2018 K. Lange
+ *
+ * Yutani Client Library
+ *
+ * Client library for the compositing window system.
  */
 #include <string.h>
 #include <stdlib.h>