diff --git a/include/ceres/solver.h b/include/ceres/solver.h
index 7d8e4e2..7776c47 100644
--- a/include/ceres/solver.h
+++ b/include/ceres/solver.h
@@ -385,7 +385,7 @@
     // Type of preconditioner to use with the iterative linear solvers.
     PreconditionerType preconditioner_type;
 
-    // Type of clustering algorithm to use visibility based
+    // Type of clustering algorithm to use for visibility based
     // preconditioning. This option is used only when the
     // preconditioner_type is CLUSTER_JACOBI or CLUSTER_TRIDIAGONAL.
     VisibilityClusteringType visibility_clustering_type;
diff --git a/include/ceres/types.h b/include/ceres/types.h
index c8c9cfe..c94bd04 100644
--- a/include/ceres/types.h
+++ b/include/ceres/types.h
@@ -134,7 +134,7 @@
   CANONICAL_VIEWS,
 
   // The classic single linkage algorithm. It is extremely fast as
-  // compared to CANONICAL_VIEWS, but can give slightly poor
+  // compared to CANONICAL_VIEWS, but can give slightly poorer
   // results. For problems with large number of cameras though, this
   // is generally a pretty good option.
   //