diff --git a/src/database/mod.rs b/src/database/mod.rs
index 27d6e4dbf..134cb6b77 100644
--- a/src/database/mod.rs
+++ b/src/database/mod.rs
@@ -214,6 +214,7 @@ pub(crate) trait DatabaseUtils: Database {
 impl<T: Database> DatabaseUtils for T {}
 
 #[cfg(test)]
+#[allow(missing_docs)]
 pub mod test {
     use bitcoin::consensus::encode::deserialize;
     use bitcoin::consensus::serialize;
diff --git a/src/keys/mod.rs b/src/keys/mod.rs
index 140f7dfdc..ac7ff57aa 100644
--- a/src/keys/mod.rs
+++ b/src/keys/mod.rs
@@ -949,7 +949,7 @@ impl std::fmt::Display for KeyError {
 impl std::error::Error for KeyError {}
 
 #[cfg(test)]
-pub mod test {
+mod test {
     use bitcoin::bip32;
 
     use super::*;
diff --git a/src/wallet/coin_selection.rs b/src/wallet/coin_selection.rs
index e85e24443..0d35f7e10 100644
--- a/src/wallet/coin_selection.rs
+++ b/src/wallet/coin_selection.rs
@@ -119,8 +119,11 @@ use std::convert::TryInto;
 /// overridden
 #[cfg(not(test))]
 pub type DefaultCoinSelectionAlgorithm = BranchAndBoundCoinSelection;
+
+/// Default deterministic coin selection algorithm for testing used by [`TxBuilder`](super::tx_builder::TxBuilder) if not
+/// overridden
 #[cfg(test)]
-pub type DefaultCoinSelectionAlgorithm = LargestFirstCoinSelection; // make the tests more predictable
+pub type DefaultCoinSelectionAlgorithm = LargestFirstCoinSelection;
 
 // Base weight of a Txin, not counting the weight needed for satisfying it.
 // prev_txid (32 bytes) + prev_vout (4 bytes) + sequence (4 bytes)