diff --git a/src/OpenFOAM/algorithms/indexedOctree/indexedOctree.H b/src/OpenFOAM/algorithms/indexedOctree/indexedOctree.H
index 0fb024f2d182688ce4ffab7c6e3b8d23e9e4a2a1..1d4c7d844f46b7079f4b64b724865749ce1448f7 100644
--- a/src/OpenFOAM/algorithms/indexedOctree/indexedOctree.H
+++ b/src/OpenFOAM/algorithms/indexedOctree/indexedOctree.H
@@ -119,7 +119,7 @@ private:
 
     // Static data
 
-        //- Relative peturbation tolerance. Determines when point is
+        //- Relative perturbation tolerance. Determines when point is
         //  considered to be close to face/edge of bb of node.
         //  The tolerance is relative to the bounding box of the smallest
         //  node.