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-rw-r--r--src/Alpha_complex/doc/Intro_alpha_complex.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/Alpha_complex/doc/Intro_alpha_complex.h b/src/Alpha_complex/doc/Intro_alpha_complex.h
index 2cb37578..1fb8fdee 100644
--- a/src/Alpha_complex/doc/Intro_alpha_complex.h
+++ b/src/Alpha_complex/doc/Intro_alpha_complex.h
@@ -20,6 +20,9 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#ifndef INTRO_ALPHA_COMPLEX_H_
+#define INTRO_ALPHA_COMPLEX_H_
+
// needs namespace for Doxygen to link on classes
namespace Gudhi {
// needs namespace for Doxygen to link on classes
@@ -117,3 +120,5 @@ namespace alphacomplex {
} // namespace alphacomplex
} // namespace Gudhi
+
+#endif // INTRO_ALPHA_COMPLEX_H_