diff --git a/topostats/default_config.yaml b/topostats/default_config.yaml
index cf8cdf1fa4f..8d01ec8aad9 100644
--- a/topostats/default_config.yaml
+++ b/topostats/default_config.yaml
@@ -74,7 +74,7 @@ disordered_tracing:
     method_outlier: mean_abs # The method to prune branches based on height. Options : abs | mean_abs | iqr.
 nodestats:
   run: true # Options : true, false
-  node_joining_length: 7.0 # The distance over which to join nearby crossing points.
+  node_joining_length: 7.0 # The distance in nanometres over which to join nearby crossing points.
   node_extend_dist: 14.0 # The distance in nanometres over which to join nearby odd-branched nodes.
   branch_pairing_length: 20.0 # The length in nanometres from the crossing point to pair and trace, obtaining FWHM's.
   pair_odd_branches: false # Whether to try and pair odd-branched nodes. Options: true and false.