diff --git a/doc/index.htm b/doc/index.htm
index 953e1620..e54b4887 100644
--- a/doc/index.htm
+++ b/doc/index.htm
@@ -51,7 +51,7 @@ interface.</p>
 </li>
 <li><a href="vector_sparse.htm">Sparse Vector</a>
 <ul>
-<li><a href="vector_sparse.htm#mapped_vector">Sparse
+<li><a href="vector_sparse.htm#mapped_vector">Mapped
 Vector</a></li>
 <li><a href="vector_sparse.htm#compressed_vector">Compressed
 Vector</a></li>
@@ -117,7 +117,7 @@ Adaptor</a></li>
 </li>
 <li><a href="matrix_sparse.htm">Sparse Matrix</a>
 <ul>
-<li><a href="matrix_sparse.htm#mapped_matrix">Sparse
+<li><a href="matrix_sparse.htm#mapped_matrix">Mapped
 Matrix</a></li>
 <li><a href="matrix_sparse.htm#compressed_matrix">Compressed
 Matrix</a></li>