diff --git a/CHANGELOG.md b/CHANGELOG.md
index 815dd78..87d754d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Replace `usize` with `bitcoin::Amount` in the primed transaction interfaces.
 
+### Fixed
+- Use the transaction size instead of weight for `sign_with_rate`. 
+Also explicitly state the expected rate unit: sat/vByte.
+
 ## [0.4.0] - 2020-09-15
 
 ### Changed
diff --git a/lib/src/bitcoin/witness/primed_transaction.rs b/lib/src/bitcoin/witness/primed_transaction.rs
index f2e9355..693305d 100644
--- a/lib/src/bitcoin/witness/primed_transaction.rs
+++ b/lib/src/bitcoin/witness/primed_transaction.rs
@@ -183,6 +183,15 @@ impl PrimedTransaction {
         }
     }
 
+    #[deprecated(
+        since = "0.4.1",
+        note = "`estimate_size` should be used instead for fee purposes."
+    )]
+    pub fn estimate_weight(&self) -> usize {
+        self._transaction_without_signatures_or_output_values()
+            .get_weight()
+    }
+
     pub fn estimate_size(&self) -> usize {
         self._transaction_without_signatures_or_output_values()
             .get_size()