diff --git a/src/t8_schemes/t8_default/t8_default_line/t8_dline_bits.h b/src/t8_schemes/t8_default/t8_default_line/t8_dline_bits.h
index 3284948bee..d59f3cf295 100644
--- a/src/t8_schemes/t8_default/t8_default_line/t8_dline_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_line/t8_dline_bits.h
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_dline_bits.h
- * Definition if line-specific functions.
+ * Definitions of line-specific functions.
  */
 
 #ifndef T8_DLINE_BITS_H
diff --git a/src/t8_schemes/t8_default/t8_default_pyramid/t8_dpyramid_bits.h b/src/t8_schemes/t8_default/t8_default_pyramid/t8_dpyramid_bits.h
index c7488e837b..14f5e35730 100644
--- a/src/t8_schemes/t8_default/t8_default_pyramid/t8_dpyramid_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_pyramid/t8_dpyramid_bits.h
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_dpyramid_bits.h
- * Definition if pyramid-specific functions.
+ * Definitions of pyramid-specific functions.
  */
 
 #ifndef T8_DPYRAMID_BITS_H
diff --git a/src/t8_schemes/t8_default/t8_default_tet/t8_dtet_bits.h b/src/t8_schemes/t8_default/t8_default_tet/t8_dtet_bits.h
index fe72be2662..0961eaba73 100644
--- a/src/t8_schemes/t8_default/t8_default_tet/t8_dtet_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_tet/t8_dtet_bits.h
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_dtet_bits.h
- * Definition if tet-specific functions.
+ * Definitions of tet-specific functions.
  * TODO: Run make doxygen and grep for files.
  *       Also document all arguments of functions.
  * TODO: Group the dtet_is functions together.
diff --git a/src/t8_schemes/t8_default/t8_default_tri/t8_dtri_bits.h b/src/t8_schemes/t8_default/t8_default_tri/t8_dtri_bits.h
index d859013ff2..8dbb06d703 100644
--- a/src/t8_schemes/t8_default/t8_default_tri/t8_dtri_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_tri/t8_dtri_bits.h
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_dtri_bits.h
- * Definition if triangle-specific functions.
+ * Definitions of triangle-specific functions.
  */
 
 #ifndef T8_DTRI_BITS_H
diff --git a/src/t8_schemes/t8_default/t8_default_vertex/t8_dvertex_bits.h b/src/t8_schemes/t8_default/t8_default_vertex/t8_dvertex_bits.h
index 5871a6db24..4ecdfd7d26 100644
--- a/src/t8_schemes/t8_default/t8_default_vertex/t8_dvertex_bits.h
+++ b/src/t8_schemes/t8_default/t8_default_vertex/t8_dvertex_bits.h
@@ -21,7 +21,7 @@
 */
 
 /** \file t8_dvertex_bits.h
- * Definition if vertex-specific functions.
+ * Definitions of vertex-specific functions.
  */
 
 #ifndef T8_DVERTEX_BITS_H