diff --git a/utility.scad b/utility.scad
index d9a54b3..c349d9e 100644
--- a/utility.scad
+++ b/utility.scad
@@ -1,16 +1,17 @@
 //////////////////////////////////////////////////////////////////////
 // LibFile: utility.scad
-//   Utility functions used in argument processing.
+//   Functions for type checking, handling undefs, processing function arguments,
+//   and testing. 
 // Includes:
 //   include <BOSL2/std.scad>
 // FileGroup: Data Management
-// FileSummary: Helpers for argument processing.
+// FileSummary: Type checking, dealing with undefs, processing function args
 // FileFootnotes: STD=Included in std.scad
 //////////////////////////////////////////////////////////////////////
 
 
 
-// Section: Type handling helpers.
+// Section: Type Checking
 
 
 // Function: typeof()
@@ -403,7 +404,7 @@ function all_defined(v,recursive=false) =
 
 
 
-// Section: Argument Helpers
+// Section: Processing Arguments to Functions and Modules
 
 
 // Function: get_anchor()
diff --git a/vectors.scad b/vectors.scad
index 51601a4..16a4a31 100644
--- a/vectors.scad
+++ b/vectors.scad
@@ -1,10 +1,13 @@
 //////////////////////////////////////////////////////////////////////
 // LibFile: vectors.scad
-//   Vector math functions.
+//   This file provides some mathematical operations that apply to each
+//   entry in a vector.  It provides normalizatoin and angle computation, and
+//   it provides functions for searching lists of vectors for matches to
+//   a given vector.  
 // Includes:
 //   include <BOSL2/std.scad>
 // FileGroup: Math
-// FileSummary: Vector math functions.
+// FileSummary: Vector arithmetic, angle, and searching.
 // FileFootnotes: STD=Included in std.scad
 //////////////////////////////////////////////////////////////////////