diff --git a/src/c_abi/mod.rs b/src/c_abi/mod.rs
index 5bbb9e9..72b0a4b 100644
--- a/src/c_abi/mod.rs
+++ b/src/c_abi/mod.rs
@@ -1,3 +1,4 @@
+//! # Low level bindings to the c library from GROMACS
 #![allow(non_upper_case_globals, non_camel_case_types)]
 
 pub mod xdr_seek;
diff --git a/src/iterator.rs b/src/iterator.rs
index 5887ece..201dcf8 100644
--- a/src/iterator.rs
+++ b/src/iterator.rs
@@ -32,11 +32,10 @@ impl IntoIterator for TRRTrajectory {
     }
 }
 
-/*
-Iterator for trajectories. This iterator yields a Result<Frame, Error>
-for each frame in the trajectory file and stops with yielding None once the
-trajectory is finished. Also yields None after the first occurence of an error
-*/
+/// Iterator for trajectories.
+/// This iterator yields a Result<Frame, Error> for each frame in the
+/// trajectory file and stops with yielding None once the trajectory is
+/// EOF. Also yields None after the first occurrence of an error
 pub struct TrajectoryIterator<T> {
     trajectory: T,
     item: Rc<Frame>,
diff --git a/src/lib.rs b/src/lib.rs
index d3331c2..e296061 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -84,6 +84,7 @@ use std::io::SeekFrom;
 use std::os::raw::{c_float, c_int};
 use std::path::{Path, PathBuf};
 
+/// File Mode for accessing trajectories.
 #[derive(Debug, Clone, PartialEq)]
 pub enum FileMode {
     Write,
@@ -233,7 +234,7 @@ pub trait Trajectory {
     fn get_num_atoms(&mut self) -> Result<usize>;
 }
 
-/// Read/Write XTC Trajectories
+/// Handle to Read/Write XTC Trajectories
 pub struct XTCTrajectory {
     handle: XDRFile,
     precision: Cell<c_float>, // internal mutability required for read method
@@ -361,7 +362,7 @@ impl io::Seek for XTCTrajectory {
     }
 }
 
-/// Read/Write TRR Trajectories
+/// Handle to Read/Write TRR Trajectories
 pub struct TRRTrajectory {
     handle: XDRFile,
     num_atoms: Lazy<Result<usize>>,