diff --git a/src/clib/pio_darray.c b/src/clib/pio_darray.c
index 08316134317..0689634bd1f 100644
--- a/src/clib/pio_darray.c
+++ b/src/clib/pio_darray.c
@@ -14,12 +14,11 @@
 #include <uthash.h>
 
 /**
- * @defgroup PIO_read_darray_c Reading Distributes Arrays in C
- * Read data from a netCDF file to a distributed array with the C API.
+ * @defgroup PIO_read_darray_c Reading Distributes Arrays
+ * Read data from a netCDF file to a distributed array in C.
  *
- * @defgroup PIO_write_darray_c Writing Distributes Arrays in C
- * Write data from a distributed array to a netCDF file with the C
- * API.
+ * @defgroup PIO_write_darray_c Writing Distributes Arrays
+ * Write data from a distributed array to a netCDF file in C.
  */
 
 /** 10MB default limit. */
diff --git a/src/clib/pio_file.c b/src/clib/pio_file.c
index e3cff3b78fd..f9703a21835 100644
--- a/src/clib/pio_file.c
+++ b/src/clib/pio_file.c
@@ -8,17 +8,17 @@
 #include <uthash.h>
 
 /**
- * @defgroup PIO_open_file_c Open a File in C
- * Open an existing netCDF file with PIO with the C API.
+ * @defgroup PIO_open_file_c Open a File
+ * Open an existing netCDF file with PIO in C.
  *
- * @defgroup PIO_create_file_c Create a File in C
- * Create a new netCDF file with PIO with the C API.
+ * @defgroup PIO_create_file_c Create a File
+ * Create a new netCDF file with PIO in C.
  *
- * @defgroup PIO_sync_file_c Sync a File in C
- * Flush buffers and sync data to disk with the C API.
+ * @defgroup PIO_sync_file_c Sync a File
+ * Flush buffers and sync data to disk in C.
  *
- * @defgroup PIO_close_file_c Close a File in C
- * Close a file with the C API.
+ * @defgroup PIO_close_file_c Close a File
+ * Close a file in C.
  *
  */
 
diff --git a/src/clib/pio_get_nc.c b/src/clib/pio_get_nc.c
index 014d523552c..7b05fe5f607 100644
--- a/src/clib/pio_get_nc.c
+++ b/src/clib/pio_get_nc.c
@@ -12,7 +12,8 @@
 #include <pio_internal.h>
 
 /**
- * @addtogroup PIO_get_var_c Get Data from a Variable in C
+ * @addtogroup PIO_get_var_c Read Data
+ * Read data from a variable in C.
  * @{
  */
 
diff --git a/src/clib/pio_nc.c b/src/clib/pio_nc.c
index 61d83623600..854e943391b 100644
--- a/src/clib/pio_nc.c
+++ b/src/clib/pio_nc.c
@@ -19,51 +19,51 @@
 #include <pio_internal.h>
 
 /**
- * @defgroup PIO_inq_c Learn About File in C
+ * @defgroup PIO_inq_c Learn About File
  * Learn the number of variables, dimensions, and global atts, and the
- * unlimited dimension.
+ * unlimited dimension in C.
  *
- * @defgroup PIO_typelen_c Learn Aboue a Data Type in C
- * Learn the length of a data type.
+ * @defgroup PIO_typelen_c Learn Aboue a Data Type
+ * Learn the length of a data type in C.
  *
- * @defgroup PIO_inq_format_c Learn About Binary Format in C
- * Learn about the binary format.
+ * @defgroup PIO_inq_format_c Learn About Binary Format
+ * Learn about the binary format in C.
  *
- * @defgroup PIO_inq_dim_c Learn About a Dimension in C
- * Learn dimension name and length.
+ * @defgroup PIO_inq_dim_c Learn About a Dimension
+ * Learn dimension name and length in C.
  *
- * @defgroup PIO_inq_var_c Learn About a Variable in C
- * Learn variable name, dimensions, and type.
+ * @defgroup PIO_inq_var_c Learn About a Variable
+ * Learn variable name, dimensions, and type in C.
  *
- * @defgroup PIO_inq_att_c Learn About an Attribute in C
- * Learn length, type, and name of an attribute.
+ * @defgroup PIO_inq_att_c Learn About an Attribute
+ * Learn length, type, and name of an attribute in C.
  *
- * @defgroup PIO_rename_dim_c Rename a Dimension in C
- * Rename a dimension.
+ * @defgroup PIO_rename_dim_c Rename a Dimension
+ * Rename a dimension in C.
  *
- * @defgroup PIO_rename_var_c Rename a Variable in C
- * Rename a variable.
+ * @defgroup PIO_rename_var_c Rename a Variable
+ * Rename a variable in C.
  *
- * @defgroup PIO_rename_att_c Rename an Attribute in C
- * Rename an attribute.
+ * @defgroup PIO_rename_att_c Rename an Attribute
+ * Rename an attribute in C.
  *
- * @defgroup PIO_del_att_c Delete an Attribute in C
- * Delete an attribute.
+ * @defgroup PIO_del_att_c Delete an Attribute
+ * Delete an attribute in C.
  *
- * @defgroup PIO_set_fill_c Set Fill Value in C
- * Set the fill value for a variable.
+ * @defgroup PIO_set_fill_c Set Fill Value
+ * Set the fill value for a variable in C.
  *
- * @defgroup PIO_enddef_c End Define Mode in C
- * End define mode.
+ * @defgroup PIO_enddef_c End Define Mode
+ * End define mode in C.
  *
- * @defgroup PIO_redef_c Re-enter Define Mode in C
- * Re-enter Define Mode.
+ * @defgroup PIO_redef_c Re-enter Define Mode
+ * Re-enter Define Mode in C.
  *
- * @defgroup PIO_def_dim_c Define a Dimension in C
- * Define a new dimension in the file.
+ * @defgroup PIO_def_dim_c Define a Dimension
+ * Define a new dimension in the file in C.
  *
- * @defgroup PIO_def_var_c Define a Variable in C
- * Define a new variable in the file.
+ * @defgroup PIO_def_var_c Define a Variable
+ * Define a new variable in the file in C.
  */
 
 /**
@@ -2632,8 +2632,8 @@ PIOc_inq_var_fill(int ncid, int varid, int *no_fill, void *fill_valuep)
 }
 
 /**
- * @addtogroup PIO_get_att_c Get Attribute Values in C
- * Get the values stored in an attribute.
+ * @addtogroup PIO_get_att_c Get Attribute Values
+ * Get the values stored in an attribute in C.
  * @{
  */
 
@@ -2925,8 +2925,8 @@ PIOc_get_att_float(int ncid, int varid, const char *name, float *ip)
  */
 
 /**
- * @addtogroup PIO_put_att_c Write an Attribute in C
- * Create an attribute.
+ * @addtogroup PIO_put_att_c Write an Attribute
+ * Create an attribute in C.
  * @{
  */
 
diff --git a/src/clib/pio_put_nc.c b/src/clib/pio_put_nc.c
index 40285b70109..9835f067f84 100644
--- a/src/clib/pio_put_nc.c
+++ b/src/clib/pio_put_nc.c
@@ -11,7 +11,8 @@
 #include <pio_internal.h>
 
 /**
- * @addtogroup PIO_put_var_c Write Data to a Variable in C
+ * @addtogroup PIO_put_var_c Write Data
+ * Write data to a Variable in C.
  * @{
  */
 
diff --git a/src/clib/pioc.c b/src/clib/pioc.c
index 7422a45364d..5e7b51fa895 100644
--- a/src/clib/pioc.c
+++ b/src/clib/pioc.c
@@ -11,40 +11,40 @@
 #include <pio_internal.h>
 
 /**
- * @defgroup PIO_init_c Initialize the IO System in C
+ * @defgroup PIO_init_c Initialize the IO System
  * Initialize the IOSystem, including specifying number of IO and
- * computation tasks.
+ * computation tasks in C.
  *
- * @defgroup PIO_finalize_c Shut Down the IO System in C
- * Shut down an IOSystem, freeing all associated resources.
+ * @defgroup PIO_finalize_c Shut Down the IO System
+ * Shut down an IOSystem, freeing all associated resources in C.
  *
  * @defgroup PIO_initdecomp_c Initialize a Decomposition
- * Intiailize a decomposition of data into distributed arrays.
+ * Intiailize a decomposition of data into distributed arrays in C.
  *
- * @defgroup PIO_freedecomp_c Free a Decomposition in C
- * Free a decomposition, and associated resources.
+ * @defgroup PIO_freedecomp_c Free a Decomposition
+ * Free a decomposition, and associated resources in C.
  *
- * @defgroup PIO_setframe_c Set the Record Number in C
+ * @defgroup PIO_setframe_c Set the Record Number
  * Set the record number for a future call to PIOc_write_darray() or
- * PIOc_read_darray().
+ * PIOc_read_darray() in C.
  *
- * @defgroup PIO_set_hint_c Set a Hint in C
- * Set an MPI Hint.
+ * @defgroup PIO_set_hint_c Set a Hint
+ * Set an MPI Hint in C.
  *
- * @defgroup PIO_error_method_c Set Error Handling in C
- * Set the error handling method in case error is encountered.
+ * @defgroup PIO_error_method_c Set Error Handling
+ * Set the error handling method in case error is encountered in C.
  *
- * @defgroup PIO_get_local_array_size_c Get the Local Size in C
- * Get the local size of a distributed array.
+ * @defgroup PIO_get_local_array_size_c Get the Local Size
+ * Get the local size of a distributed array in C.
  *
- * @defgroup PIO_iosystem_is_active_c Check IOSystem in C
- * Is the IO system active?
+ * @defgroup PIO_iosystem_is_active_c Check IOSystem
+ * Is the IO system active (in C)?
  *
- * @defgroup PIO_getnumiotasks_c Get Number IO Tasks in C
- * Get the Number of IO Tasks.
+ * @defgroup PIO_getnumiotasks_c Get Number IO Tasks
+ * Get the Number of IO Tasks in C.
  *
- * @defgroup PIO_set_blocksize_c Set Blocksize in C
- * Set the Blocksize.
+ * @defgroup PIO_set_blocksize_c Set Blocksize
+ * Set the Blocksize in C.
  */
 
 /** The default error handler used when iosystem cannot be located. */