diff --git a/doc/includes/references.h b/doc/includes/references.h
index 6b38571b..355b5183 100644
--- a/doc/includes/references.h
+++ b/doc/includes/references.h
@@ -910,7 +910,7 @@ struct mjModel_ {
   int ncam;                       // number of cameras
   int nlight;                     // number of lights
   int nflex;                      // number of flexes
-  int nflexnode;                   // number of dofs in all flexes
+  int nflexnode;                  // number of dofs in all flexes
   int nflexvert;                  // number of vertices in all flexes
   int nflexedge;                  // number of edges in all flexes
   int nflexelem;                  // number of elements in all flexes
diff --git a/include/mujoco/mjmodel.h b/include/mujoco/mjmodel.h
index 9f76205f..185d31de 100644
--- a/include/mujoco/mjmodel.h
+++ b/include/mujoco/mjmodel.h
@@ -611,7 +611,7 @@ struct mjModel_ {
   int ncam;                       // number of cameras
   int nlight;                     // number of lights
   int nflex;                      // number of flexes
-  int nflexnode;                   // number of dofs in all flexes
+  int nflexnode;                  // number of dofs in all flexes
   int nflexvert;                  // number of vertices in all flexes
   int nflexedge;                  // number of edges in all flexes
   int nflexelem;                  // number of elements in all flexes