diff --git a/docs/source/nnls_modeling.rst b/docs/source/nnls_modeling.rst
index b95796b..1b7287f 100644
--- a/docs/source/nnls_modeling.rst
+++ b/docs/source/nnls_modeling.rst
@@ -1777,10 +1777,10 @@
 .. function:: bool Problem::IsParameterBlockConstant(const double* values) const
 
    Returns ``true`` if a parameter block is set constant, and false
-   otherwise. A parameter block may be set constant in two
-   ways. Either by calling ``SetParameterBlockConstant`` or by
-   associating a ``LocalParameterization`` with a zero dimensional
-   tangent space with it.
+   otherwise. A parameter block may be set constant in two ways:
+   either by calling ``SetParameterBlockConstant`` or by associating a
+   ``LocalParameterization`` with a zero dimensional tangent space
+   with it.
 
 .. function:: void Problem::SetParameterization(double* values, LocalParameterization* local_parameterization)
 
diff --git a/include/ceres/problem.h b/include/ceres/problem.h
index 977a708..88f9966 100644
--- a/include/ceres/problem.h
+++ b/include/ceres/problem.h
@@ -309,10 +309,10 @@
   void SetParameterBlockVariable(double* values);
 
   // Returns true if a parameter block is set constant, and false
-  // otherwise. A parameter block may be set constant in two
-  // ways. Either by calling SetParameterBlockConstant or by
-  // associating a LocalParameterization with a zero dimensional
-  // tangent space with it.
+  // otherwise. A parameter block may be set constant in two ways:
+  // either by calling SetParameterBlockConstant or by associating a
+  // LocalParameterization with a zero dimensional tangent space with
+  // it.
   bool IsParameterBlockConstant(const double* values) const;
 
   // Set the local parameterization for one of the parameter blocks.
diff --git a/internal/ceres/solver_test.cc b/internal/ceres/solver_test.cc
index 58148b2..c4823be 100644
--- a/internal/ceres/solver_test.cc
+++ b/internal/ceres/solver_test.cc
@@ -518,17 +518,15 @@
   Problem problem;
   problem.AddResidualBlock(LinearCostFunction::Create(), nullptr, &x, &y);
   problem.SetParameterization(&y, new SubsetParameterization(1, {0}));
-  // Zero dimensional tangent space means that the block is
-  // effectively constant, but because the user did not mark it
-  // constant explicitly, the user will not see it as constant when
-  // querying IsParameterBlockConstant.
   EXPECT_TRUE(problem.IsParameterBlockConstant(&y));
+
   Solver::Options options;
   options.function_tolerance = 0.0;
   options.gradient_tolerance = 0.0;
   options.parameter_tolerance = 0.0;
   Solver::Summary summary;
   Solve(options, &problem, &summary);
+
   EXPECT_EQ(summary.termination_type, CONVERGENCE);
   EXPECT_NEAR(x, 10.0, 1e-7);
   EXPECT_EQ(y, 1.0);