1 files changed, 2 insertions, 1 deletions
diff --git a/src/Persistent_cohomology/example/plain_homology.cpp b/src/Persistent_cohomology/example/plain_homology.cpp
index f8fab93c..2c4e7aa2 100644
--- a/src/Persistent_cohomology/example/plain_homology.cpp
+++ b/src/Persistent_cohomology/example/plain_homology.cpp
@@ -25,6 +25,7 @@
 
 #include <iostream>
 #include <vector>
+#include <cstdint>  // for std::uint8_t
 
 using namespace Gudhi;
 
@@ -39,7 +40,7 @@ struct MyOptions : Simplex_tree_options_full_featured {
   static const bool store_key = true;
   // I have few vertices
   typedef short Vertex_handle;
-  // Maximum number of simplices to compute persistence is 2^8 = 256
+  // Maximum number of simplices to compute persistence is 2^8 = 256.
   typedef std::uint8_t Simplex_key;
 };
 typedef Simplex_tree<MyOptions> ST;