diff --git a/darshan-runtime/lib/darshan-dxt.c b/darshan-runtime/lib/darshan-dxt.c
index 7412b4e4c..ba023b5e5 100644
--- a/darshan-runtime/lib/darshan-dxt.c
+++ b/darshan-runtime/lib/darshan-dxt.c
@@ -227,6 +227,7 @@ void dxt_posix_write(darshan_record_id rec_id, int64_t offset,
 {
     struct dxt_file_record_ref* rec_ref = NULL;
     struct dxt_file_record *file_rec;
+    char *s;
 
     DXT_LOCK();
 
@@ -262,6 +263,13 @@ void dxt_posix_write(darshan_record_id rec_id, int64_t offset,
     rec_ref->write_traces[file_rec->write_count].length = length;
     rec_ref->write_traces[file_rec->write_count].start_time = start_time;
     rec_ref->write_traces[file_rec->write_count].end_time = end_time;
+    s = getenv("DARSHAN_DXT_EXTRA_INFO");
+    if (s != NULL) {
+        strncpy(rec_ref->write_traces[file_rec->write_count].extra_info, s,
+                EXTRA_INFO_LEN-1);
+    } else {
+        rec_ref->write_traces[file_rec->write_count].extra_info[0] = '\0';
+    }
     file_rec->write_count += 1;
 
     DXT_UNLOCK();
@@ -272,6 +280,7 @@ void dxt_posix_read(darshan_record_id rec_id, int64_t offset,
 {
     struct dxt_file_record_ref* rec_ref = NULL;
     struct dxt_file_record *file_rec;
+    char *s;
 
     DXT_LOCK();
 
@@ -307,6 +316,14 @@ void dxt_posix_read(darshan_record_id rec_id, int64_t offset,
     rec_ref->read_traces[file_rec->read_count].length = length;
     rec_ref->read_traces[file_rec->read_count].start_time = start_time;
     rec_ref->read_traces[file_rec->read_count].end_time = end_time;
+    s = getenv("DARSHAN_DXT_EXTRA_INFO");
+    if (s != NULL) {
+        strncpy(rec_ref->read_traces[file_rec->read_count].extra_info, s,
+                EXTRA_INFO_LEN-1);
+    } else {
+        rec_ref->write_traces[file_rec->write_count].extra_info[0] = '\0';
+    }
+
     file_rec->read_count += 1;
 
     DXT_UNLOCK();
@@ -317,6 +334,7 @@ void dxt_mpiio_write(darshan_record_id rec_id, int64_t offset,
 {
     struct dxt_file_record_ref* rec_ref = NULL;
     struct dxt_file_record *file_rec;
+    char *s;
 
     DXT_LOCK();
 
@@ -352,6 +370,13 @@ void dxt_mpiio_write(darshan_record_id rec_id, int64_t offset,
     rec_ref->write_traces[file_rec->write_count].offset = offset;
     rec_ref->write_traces[file_rec->write_count].start_time = start_time;
     rec_ref->write_traces[file_rec->write_count].end_time = end_time;
+    s = getenv("DARSHAN_DXT_EXTRA_INFO");
+    if (s != NULL) {
+        strncpy(rec_ref->write_traces[file_rec->write_count].extra_info, s,
+                EXTRA_INFO_LEN-1);
+    } else {
+        rec_ref->write_traces[file_rec->write_count].extra_info[0] = '\0';
+    }
     file_rec->write_count += 1;
 
     DXT_UNLOCK();
@@ -362,6 +387,7 @@ void dxt_mpiio_read(darshan_record_id rec_id, int64_t offset,
 {
     struct dxt_file_record_ref* rec_ref = NULL;
     struct dxt_file_record *file_rec;
+    char *s;
 
     DXT_LOCK();
 
@@ -397,6 +423,13 @@ void dxt_mpiio_read(darshan_record_id rec_id, int64_t offset,
     rec_ref->read_traces[file_rec->read_count].offset = offset;
     rec_ref->read_traces[file_rec->read_count].start_time = start_time;
     rec_ref->read_traces[file_rec->read_count].end_time = end_time;
+    s = getenv("DARSHAN_DXT_EXTRA_INFO");
+    if (s != NULL) {
+        strncpy(rec_ref->read_traces[file_rec->read_count].extra_info, s,
+                EXTRA_INFO_LEN-1);
+    } else {
+        rec_ref->write_traces[file_rec->write_count].extra_info[0] = '\0';
+    }
     file_rec->read_count += 1;
 
     DXT_UNLOCK();
diff --git a/darshan-util/darshan-dxt-logutils.c b/darshan-util/darshan-dxt-logutils.c
index 28eb50a52..aa7e2415d 100644
--- a/darshan-util/darshan-dxt-logutils.c
+++ b/darshan-util/darshan-dxt-logutils.c
@@ -294,6 +294,7 @@ void dxt_log_print_posix_file(void *posix_file_rec, char *file_name,
     int64_t length;
     double start_time;
     double end_time;
+    char *extra_info;
     int i;
 
     darshan_record_id f_id = file_rec->base_rec.id;
@@ -352,8 +353,10 @@ void dxt_log_print_posix_file(void *posix_file_rec, char *file_name,
         length = io_trace[i].length;
         start_time = io_trace[i].start_time;
         end_time = io_trace[i].end_time;
+        extra_info = io_trace[i].extra_info;
+        if (*extra_info == '\0') *extra_info = "";
 
-        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f", "X_POSIX", rank, "write", i, offset, length, start_time, end_time);
+        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f %s", "X_POSIX", rank, "write", i, offset, length, start_time, end_time, extra_info);
 
         if (lustreFS) {
             cur_offset = offset;
@@ -380,8 +383,10 @@ void dxt_log_print_posix_file(void *posix_file_rec, char *file_name,
         length = io_trace[i].length;
         start_time = io_trace[i].start_time;
         end_time = io_trace[i].end_time;
+        extra_info = io_trace[i].extra_info;
+        if (extra_info == NULL) extra_info = "";
 
-        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f", "X_POSIX", rank, "read", (int)(i - write_count), offset, length, start_time, end_time);
+        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f %s", "X_POSIX", rank, "read", (int)(i - write_count), offset, length, start_time, end_time, extra_info);
 
         if (lustreFS) {
             cur_offset = offset;
@@ -415,6 +420,7 @@ void dxt_log_print_mpiio_file(void *mpiio_file_rec, char *file_name,
     int64_t offset;
     double start_time;
     double end_time;
+    char * extra_info;
     int i;
 
     darshan_record_id f_id = file_rec->base_rec.id;
@@ -443,8 +449,10 @@ void dxt_log_print_mpiio_file(void *mpiio_file_rec, char *file_name,
         length = io_trace[i].length;
         start_time = io_trace[i].start_time;
         end_time = io_trace[i].end_time;
+        extra_info = io_trace[i].extra_info;
+        if (extra_info == NULL) extra_info = "";
 
-        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f\n", "X_MPIIO", rank, "write", i, offset, length, start_time, end_time);
+        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f %s\n", "X_MPIIO", rank, "write", i, offset, length, start_time, end_time, extra_info);
     }
 
     for (i = write_count; i < write_count + read_count; i++) {
@@ -453,7 +461,7 @@ void dxt_log_print_mpiio_file(void *mpiio_file_rec, char *file_name,
         start_time = io_trace[i].start_time;
         end_time = io_trace[i].end_time;
 
-        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f\n", "X_MPIIO", rank, "read", (int)(i - write_count), offset, length, start_time, end_time);
+        printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f %s\n", "X_MPIIO", rank, "read", (int)(i - write_count), offset, length, start_time, end_time, extra_info);
     }
 
     return;
diff --git a/include/darshan-dxt-log-format.h b/include/darshan-dxt-log-format.h
index b31fc9928..5f40ae837 100644
--- a/include/darshan-dxt-log-format.h
+++ b/include/darshan-dxt-log-format.h
@@ -10,6 +10,7 @@
 #define DXT_POSIX_VER 1
 #define DXT_MPIIO_VER 2
 
+#define EXTRA_INFO_LEN 64
 #define HOSTNAME_SIZE 64
 
 /*
@@ -21,6 +22,7 @@ typedef struct segment_info {
     int64_t length;
     double start_time;
     double end_time;
+    char extra_info[EXTRA_INFO_LEN];
 } segment_info;
 
 #define X(a) a,