diff --git a/filament/include/filament/Box.h b/filament/include/filament/Box.h
index 570ec853d2..5a7025a7ee 100644
--- a/filament/include/filament/Box.h
+++ b/filament/include/filament/Box.h
@@ -95,7 +95,7 @@ public:
     }
 
     /**
-     * Computes the smalest bounding sphere of the box.
+     * Computes the smallest bounding sphere of the box.
      * @return The smallest sphere defined by its center (.xyz) and radius (.w) that contains *this
      */
     filament::math::float4 getBoundingSphere() const noexcept {
diff --git a/filament/include/filament/Frustum.h b/filament/include/filament/Frustum.h
index 0e6917a259..86d6816c58 100644
--- a/filament/include/filament/Frustum.h
+++ b/filament/include/filament/Frustum.h
@@ -54,33 +54,33 @@ public:
     Frustum& operator=(Frustum&& rhs) noexcept = default;
 
     /**
-     * Create a frustum from a projection matrix (usually the projection * view matrix)
+     * Creates a frustum from a projection matrix (usually the projection * view matrix)
      * @param pv a 4x4 projection matrix
      */
     explicit Frustum(const filament::math::mat4f& pv);
 
     /**
-     * Set the frustum from the given projection matrix
+     * Sets the frustum from the given projection matrix
      * @param pv a 4x4 projection matrix
      */
     void setProjection(const filament::math::mat4f& pv);
 
     /**
-     * Return the plane equation parameters with normalized normals
+     * Returns the plane equation parameters with normalized normals
      * @param plane Identifier of the plane to retrieve the equation of
      * @return A plane equation encoded a float4 R such as R.x*x + R.y*y + R.z*z = R.w
      */
     filament::math::float4 getNormalizedPlane(Plane plane) const noexcept;
 
     /**
-     * Return a copy of all six frustum planes in left, right, bottom, top, far, near order
+     * Returns a copy of all six frustum planes in left, right, bottom, top, far, near order
      * @param planes six plane equations encoded as in getNormalizedPlane() in
      *              left, right, bottom, top, far, near order
      */
     void getNormalizedPlanes(filament::math::float4 planes[6]) const noexcept;
 
     /**
-     * Return all six frustum planes in left, right, bottom, top, far, near order
+     * Returns all six frustum planes in left, right, bottom, top, far, near order
      * @return six plane equations encoded as in getNormalizedPlane() in
      *              left, right, bottom, top, far, near order
      */