openpgp: Improve documentation.

1 files changed, 4 insertions, 2 deletions

diff --git a/openpgp/src/crypto/mpi.rs b/openpgp/src/crypto/mpi.rs
index 4ecde45b..f58f0670 100644
--- a/openpgp/src/crypto/mpi.rs
+++ b/openpgp/src/crypto/mpi.rs
@@ -157,7 +157,8 @@ impl MPI {
     ///
     /// Returns `Error::UnsupportedEllipticCurve` if the curve is not
     /// supported, `Error::MalformedMPI` if the point is formatted
-    /// incorrectly.
+    /// incorrectly, `Error::InvalidOperation` if the given curve is
+    /// operating on native octet strings.
     pub fn decode_point(&self, curve: &Curve) -> Result<(&[u8], &[u8])> {
         Self::decode_point_common(self.value(), curve)
     }
@@ -431,7 +432,8 @@ impl ProtectedMPI {
     ///
     /// Returns `Error::UnsupportedEllipticCurve` if the curve is not
     /// supported, `Error::MalformedMPI` if the point is formatted
-    /// incorrectly.
+    /// incorrectly, `Error::InvalidOperation` if the given curve is
+    /// operating on native octet strings.
     pub fn decode_point(&self, curve: &Curve) -> Result<(&[u8], &[u8])> {
         MPI::decode_point_common(self.value(), curve)
     }