diff --git a/interpolation.cabal b/interpolation.cabal
--- a/interpolation.cabal
+++ b/interpolation.cabal
@@ -1,5 +1,5 @@
 Name:             interpolation
-Version:          0.1.0.1
+Version:          0.1.0.2
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann
@@ -47,7 +47,7 @@
   default:     True
 
 Source-Repository this
-  Tag:         0.1.0.1
+  Tag:         0.1.0.2
   Type:        darcs
   Location:    http://hub.darcs.net/thielema/interpolation/
 
diff --git a/src/Numeric/Interpolation/Basis.hs b/src/Numeric/Interpolation/Basis.hs
--- a/src/Numeric/Interpolation/Basis.hs
+++ b/src/Numeric/Interpolation/Basis.hs
@@ -1,8 +1,24 @@
+{- |
+Generate lists of basis functions with respect to interpolation nodes
+and generate functions from coefficients with respect to these bases.
+
+A basis function is one where all but one features are zero.
+E.g. in a linear basis a basis function is one at one node,
+and zero at all the other interpolation nodes.
+
+You need the basis functions
+for setting up the matrix for a linear least-squares solver for curve fitting.
+The solver computes some coefficients
+and in a second step you convert these coefficients
+to the piecewise interpolation function.
+-}
 module Numeric.Interpolation.Basis (
+   -- * Interpolation basis functions
    Compact.linear,
    Compact.hermite1,
    Compact.cubicLinear,
    Compact.cubicParabola,
+   -- * Construct functions from the coefficients with respect to a basis
    coefficientsToLinear,
    coefficientsToHermite1,
    coefficientsToCubicLinear,
diff --git a/src/Numeric/Interpolation/Basis/Compact.hs b/src/Numeric/Interpolation/Basis/Compact.hs
--- a/src/Numeric/Interpolation/Basis/Compact.hs
+++ b/src/Numeric/Interpolation/Basis/Compact.hs
@@ -1,3 +1,6 @@
+{- |
+Interpolation basis functions represented with a minimum of required nodes.
+-}
 module Numeric.Interpolation.Basis.Compact (
    linear, hermite1, cubicLinear, cubicParabola,
    ) where
diff --git a/src/Numeric/Interpolation/Basis/Full.hs b/src/Numeric/Interpolation/Basis/Full.hs
--- a/src/Numeric/Interpolation/Basis/Full.hs
+++ b/src/Numeric/Interpolation/Basis/Full.hs
@@ -1,3 +1,9 @@
+{- |
+Interpolation basis functions using all given nodes.
+The represented functions are equivalent to the ones from
+"Numeric.Interpolation.Basis.Compact"
+but less efficient for evaluation.
+-}
 module Numeric.Interpolation.Basis.Full (linear, hermite1) where
 
 import qualified Numeric.Interpolation.NodeList as Nodes