diff --git a/src/clib/pio_darray.c b/src/clib/pio_darray.c
index c04e4de93bf..08316134317 100644
--- a/src/clib/pio_darray.c
+++ b/src/clib/pio_darray.c
@@ -14,10 +14,12 @@
 #include <uthash.h>
 
 /**
- * @defgroup PIO_read_darray_c Reading Distributes Arrays
+ * @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_write_darray_c Writing Distributes Arrays
- * Write data from a distributed array to a netCDF file with the C API.
+ *
+ * @defgroup PIO_write_darray_c Writing Distributes Arrays in C
+ * Write data from a distributed array to a netCDF file with the C
+ * API.
  */
 
 /** 10MB default limit. */
diff --git a/src/clib/pio_file.c b/src/clib/pio_file.c
index 6bf3cf0ba4d..e3cff3b78fd 100644
--- a/src/clib/pio_file.c
+++ b/src/clib/pio_file.c
@@ -8,14 +8,18 @@
 #include <uthash.h>
 
 /**
- * @defgroup PIO_open_file_c Open a File
+ * @defgroup PIO_open_file_c Open a File in C
  * Open an existing netCDF file with PIO with the C API.
- * @defgroup PIO_create_file_c Create a File
+ *
+ * @defgroup PIO_create_file_c Create a File in C
  * Create a new netCDF file with PIO with the C API.
- * @defgroup PIO_sync_file_c Sync a File
+ *
+ * @defgroup PIO_sync_file_c Sync a File in C
  * Flush buffers and sync data to disk with the C API.
- * @defgroup PIO_close_file_c Close a File
+ *
+ * @defgroup PIO_close_file_c Close a File in C
  * Close a file with the C API.
+ *
  */
 
 /* This is the next ncid that will be used when a file is opened or
diff --git a/src/clib/pio_nc.c b/src/clib/pio_nc.c
index 37a20bd0150..9907efc3bab 100644
--- a/src/clib/pio_nc.c
+++ b/src/clib/pio_nc.c
@@ -22,32 +22,46 @@
  * @defgroup PIO_inq_c Learn About File
  * Learn the number of variables, dimensions, and global atts, and the
  * unlimited dimension.
+ *
  * @defgroup PIO_typelen_c Learn Aboue a Data Type
  * Learn the length of a data type.
+ *
  * @defgroup PIO_inq_format_c Learn About Binary Format
  * Learn about the binary format.
+ *
  * @defgroup PIO_inq_dim_c Learn About a Dimension
  * Learn dimension name and length.
+ *
  * @defgroup PIO_inq_var_c Learn About a Variable
  * Learn variable name, dimensions, and type.
+ *
  * @defgroup PIO_inq_att_c Learn About an Attribute
  * Learn length, type, and name of an attribute.
+ *
  * @defgroup PIO_rename_dim_c Rename a Dimension
  * Rename a dimension.
+ *
  * @defgroup PIO_rename_var_c Rename a Variable
  * Rename a variable.
+ *
  * @defgroup PIO_rename_att_c Rename an Attribute
  * Rename an attribute.
+ *
  * @defgroup PIO_del_att_c Delete an Attribute
  * Delete an attribute.
+ *
  * @defgroup PIO_set_fill_c Set Fill Value
  * Set the fill value for a variable.
+ *
  * @defgroup PIO_enddef_c End Define Mode
  * End define mode.
+ *
  * @defgroup PIO_redef_c Re-enter Define Mode
  * Re-enter Define Mode.
+ *
  * @defgroup PIO_def_dim_c Define a Dimension
  * Define a new dimension in the file.
+ *
  * @defgroup PIO_def_var_c Define a Variable
  * Define a new variable in the file.
  */
diff --git a/src/clib/pioc.c b/src/clib/pioc.c
index 39488ca77fe..a409bd45a09 100644
--- a/src/clib/pioc.c
+++ b/src/clib/pioc.c
@@ -12,27 +12,38 @@
 
 /**
  * @defgroup PIO_init_c Initialize the IO System
- * Initialize the IOSystem, including specifying number of IO and computation tasks.
- * @defgroup PIO_finalize_c Shut Down the IO System
+ * Initialize the IOSystem, including specifying number of IO and
+ * computation tasks.
+ *
+ * @defgroup PIO_finalize_c Shut Down the IO System in C
  * Shut down an IOSystem, freeing all associated resources.
+ *
  * @defgroup PIO_initdecomp_c Initialize a Decomposition
  * Intiailize a decomposition of data into distributed arrays.
- * @defgroup PIO_freedecomp_c Free a Decomposition
+ *
+ * @defgroup PIO_freedecomp_c Free a Decomposition in C
  * Free a decomposition, and associated resources.
- * @defgroup PIO_setframe_c Set the Record Number
+ *
+ * @defgroup PIO_setframe_c Set the Record Number in C
  * Set the record number for a future call to PIOc_write_darray() or
  * PIOc_read_darray().
- * @defgroup PIO_set_hint_c Set a Hint
+ *
+ * @defgroup PIO_set_hint_c Set a Hint in C
  * Set an MPI Hint.
- * @defgroup PIO_error_method_c Set Error Handling
+ *
+ * @defgroup PIO_error_method_c Set Error Handling in C
  * Set the error handling method in case error is encountered.
- * @defgroup PIO_get_local_array_size_c Get the Local Size
+ *
+ * @defgroup PIO_get_local_array_size_c Get the Local Size in C
  * Get the local size of a distributed array.
- * @defgroup PIO_iosystem_is_active_c Check IOSystem
+ *
+ * @defgroup PIO_iosystem_is_active_c Check IOSystem in C
  * Is the IO system active?
- * @defgroup PIO_getnumiotasks_c Get Number IO Tasks
+ *
+ * @defgroup PIO_getnumiotasks_c Get Number IO Tasks in C
  * Get the Number of IO Tasks.
- * @defgroup PIO_set_blocksize_c Set Blocksize
+ *
+ * @defgroup PIO_set_blocksize_c Set Blocksize in C
  * Set the Blocksize.
  */