diff --git a/src/descriptors/dct.rs b/src/descriptors/dct.rs
index d6835fa..15cb98a 100644
--- a/src/descriptors/dct.rs
+++ b/src/descriptors/dct.rs
@@ -20,7 +20,8 @@ impl DCT {
         DCT { quantization_matrix }
     }
 
-    // Builds DCT with given quality value
+    /// Builds DCT with given quality value
+    /// quality
     pub fn with_quality(mut self, quality: u8) -> Self {
         let mut quantization_matrix: [u8; 64] = [0; 64];
         let scalar: f32 = match quality {
@@ -38,6 +39,7 @@ impl DCT {
         self
     }
 
+    /// 
     fn dct(&self, img: &image::DynamicImage) -> [f64; 64] {
         let mut dct_values: [f64; 64] = [0.0; 64];
         for u in 0..8 {
diff --git a/src/descriptors/mod.rs b/src/descriptors/mod.rs
index fe0690f..88ccf30 100644
--- a/src/descriptors/mod.rs
+++ b/src/descriptors/mod.rs
@@ -1,3 +1,6 @@
+//! Descriptors that can be used to describe an image.
+//! If two images are (almost) the same, their descriptions will be the same.
+
 pub trait Descriptor {
     fn info(&self) -> String {
         "Descriptor".to_string()
diff --git a/src/lib.rs b/src/lib.rs
index c807575..ea0f982 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,6 @@
+//! Near-copy image similarity detection.
+
+//! Descriptors that can be used to describe an image.
+//! If two images are (almost) the same, their descriptions will be the same.
 pub mod descriptors;
 pub mod store;
\ No newline at end of file
diff --git a/src/store.rs b/src/store.rs
index 04a6029..99f9940 100644
--- a/src/store.rs
+++ b/src/store.rs
@@ -1,3 +1,6 @@
+//! Persistent store of all calculated image descriptions.
+//! Can be queried to find identical or similar images.
+
 use std::collections::HashMap;
 use crate::descriptors::Descriptor;
 use std::fs;