diff --git a/compact_sets.py b/compact_sets.py
index 7e6277a..2d8e4f0 100644
--- a/compact_sets.py
+++ b/compact_sets.py
@@ -586,11 +586,10 @@ class HarmonicSpace:
         """
         Build all valid movement maps for c1 -> c2_transposed.
 
-        A movement map shows which pitch in c1 maps to which pitch in c2,
-        including the cent difference for each movement.
+        A movement map shows which position in c1 maps to which position in c2.
 
         Returns:
-            List of movement maps. Each map is {source_pitch: {"destination": dest_pitch, "cent_difference": cents}}
+            List of movement maps. Each map is {src_idx: dest_idx}
             There may be multiple valid maps if multiple changing pitches can be permuted.
         """
         # Find common pitches (same pitch class in both)