diff --git a/Interfaces/IFluxImage.cs b/Interfaces/IFluxImage.cs
index 21a5e12..b92eed8 100644
--- a/Interfaces/IFluxImage.cs
+++ b/Interfaces/IFluxImage.cs
@@ -44,6 +44,15 @@ namespace Aaru.CommonTypes.Interfaces;
 /// <summary>Abstract class to implement flux reading plugins.</summary>
 public interface IFluxImage : IBaseImage
 {
+    /// <summary>
+    ///     An image may have tracks split into sub-steps. This returns the highest sub-step index for the track.
+    /// </summary>
+    /// <returns>Error number</returns>
+    /// <param name="head">Physical head (0-based)</param>
+    /// <param name="track">Physical track (position of the heads over the floppy media, 0-based)</param>
+    /// <param name="length">The number of captures</param>
+    ErrorNumber SubTrackLength(uint head, ushort track, out byte length);
+
     /// <summary>
     ///     An image may have more than one capture for a specific head/track/sub-track combination. This returns
     ///     the amount of captures in the image for the specified head/track/sub-track combination.
diff --git a/Interfaces/IWritableFluxImage.cs b/Interfaces/IWritableFluxImage.cs
index 3b58378..0369e75 100644
--- a/Interfaces/IWritableFluxImage.cs
+++ b/Interfaces/IWritableFluxImage.cs
@@ -46,9 +46,10 @@ public interface IWritableFluxImage : IFluxImage, IWritableImage
 {
     /// <summary>Writes a flux capture.</summary>
     /// <returns>Error number</returns>
-    /// <param name="resolution">The capture's resolution (sample rate) in picoseconds</param>
-    /// <param name="index">Flux representation of the index signal</param>
-    /// <param name="data">Flux representation of the data signal</param>
+    /// <param name="indexResolution">The capture's index resolution (sample rate) in picoseconds</param>
+    /// <param name="dataResolution">The capture's data resolution (sample rate) in picoseconds</param>
+    /// <param name="indexBuffer">Flux representation of the index signal</param>
+    /// <param name="dataBuffer">Flux representation of the data signal</param>
     /// <param name="head">Physical head (0-based)</param>
     /// <param name="track">Physical track (position of the heads over the floppy media, 0-based)</param>
     /// <param name="subTrack">Physical sub-step of track (e.g. half-track)</param>