diff --git a/parsers/survex.py b/parsers/survex.py
index 8d6cb33..1e63051 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -30,6 +30,12 @@ todo = '''
 - LoadSurvexFile() Creates a new current survexfile and valid .survexdirectory
         The survexblock passed-in is not necessarily the parent. FIX THIS.
         
+- When Olly implements LEG in the  'dump3d --legs' utility, then we can use that to get the length of
+all the legs in a survex block instead of adding them up oursleves. Which means that we can
+ignore all the  Units and offset stuff, that troggle will work with survex files with backsights,
+repeated readings from distox etc.. Not actually useful for pre 2022 survey data, but good future-proofing.
+Also it will be a tiny bit more accurate as these leg lengths are after loop closure fixup.
+        
 '''
 survexblockroot = None
 survexomitsroot = None