diff --git a/src/correlation_match.rs b/src/correlation_match.rs
index 86adda4..f8a5614 100644
--- a/src/correlation_match.rs
+++ b/src/correlation_match.rs
@@ -1,3 +1,5 @@
+//! Finds the closest match of a shorter piece of audio from a larger piece of audio.
+//!
 //! Design sketch in Finnish:
 //!
 //! Algoritmi, joka etsii pidemmästä äänenpätkästä A sen kohdan, jossa
@@ -27,6 +29,7 @@
 use crate::cross_correlation::CrossCorrelation;
 use crate::math::*;
 
+/// A structure prepared to perform correlation matches up to a given size.
 pub struct CorrelationMatch {
     max_size: usize,
     cross_correlation: CrossCorrelation,
diff --git a/src/cross_correlation.rs b/src/cross_correlation.rs
index 5f2b851..35acf7b 100644
--- a/src/cross_correlation.rs
+++ b/src/cross_correlation.rs
@@ -4,6 +4,7 @@ use crate::fft;
 use crate::math::*;
 use std::array::IntoIter;
 
+/// A structure prepared to perform cross correlations up to a given maximum size.
 pub struct CrossCorrelation {
     base_size: usize,
     fft_size: usize,
diff --git a/src/fft.rs b/src/fft.rs
index 64aee28..091f85f 100644
--- a/src/fft.rs
+++ b/src/fft.rs
@@ -1,4 +1,4 @@
-//! This module implements the FFT, i.e. Fast Fourier Transform, and its inverse.
+//! Implements the FFT, i.e. Fast Fourier Transform, and its inverse.
 
 use crate::math::*;
 
diff --git a/src/math.rs b/src/math.rs
index 2838986..68440e6 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -1,5 +1,5 @@
-//! This module defines mathematical structures and operations, primarily relating
-//! to complex numbers.
+//! Defines mathematical structures and operations, primarily relating to complex
+//! numbers.
 
 // The project is being worked on, and not all operations defined in this file are
 // used anywhere yet. Therefore we allow "dead code".