diff --git a/IndexFlat.h b/IndexFlat.h
index 3f8cff90ee..49f0c59d80 100644
--- a/IndexFlat.h
+++ b/IndexFlat.h
@@ -59,7 +59,7 @@ struct IndexFlat: Index {
             const idx_t *labels) const;
 
     /** remove some ids. NB that Because of the structure of the
-     * indexing structre, the semantics of this operation are
+     * indexing structure, the semantics of this operation are
      * different from the usual ones: the new ids are shifted */
     size_t remove_ids(const IDSelector& sel) override;