diff --git a/tests/t1020-addtolistfile.sh b/tests/t1020-addtolistfile.sh
index 42cad3c..4ddea44 100755
--- a/tests/t1020-addtolistfile.sh
+++ b/tests/t1020-addtolistfile.sh
@@ -39,6 +39,24 @@ GARDEN: 2 added.
 GARDEN: 2 of 2 tasks shown
 EOF
 
+#
+# List available files
+#
+test_todo_session 'list available files' <<EOF
+>>> todo.sh listfile
+Files in the todo.txt directory:
+done.txt
+garden.txt
+report.txt
+todo.txt
+
+>>> TODOTXT_VERBOSE=0 todo.sh listfile
+done.txt
+garden.txt
+report.txt
+todo.txt
+EOF
+
 #
 # Filter
 #
diff --git a/todo.sh b/todo.sh
index c2fa85c..9351e38 100755
--- a/todo.sh
+++ b/todo.sh
@@ -57,7 +57,7 @@ shorthelp()
 		    list|ls [TERM...]
 		    listall|lsa [TERM...]
 		    listcon|lsc
-		    listfile|lf SRC [TERM...]
+		    listfile|lf [SRC [TERM...]]
 		    listpri|lsp [PRIORITY] [TERM...]
 		    listproj|lsprj [TERM...]
 		    move|mv ITEM# DEST [SRC]
@@ -211,11 +211,13 @@ help()
 		    lsc
 		      Lists all the task contexts that start with the @ sign in todo.txt.
 
-		    listfile SRC [TERM...]
-		    lf SRC [TERM...]
+		    listfile [SRC [TERM...]]
+		    lf [SRC [TERM...]]
 		      Displays all the lines in SRC file located in the todo.txt directory,
 		      sorted by priority with line  numbers.  If TERM specified, lists
 		      all lines that contain TERM in SRC file.
+		      Without any arguments, the names of all text files in the todo.txt
+		      directory are listed.
 
 		    listpri [PRIORITY] [TERM...]
 		    lsp [PRIORITY] [TERM...]
@@ -1049,10 +1051,15 @@ case $action in
 
 "listfile" | "lf" )
     shift  ## Was listfile, next $1 is file name
-    FILE="$1"
-    shift  ## Was filename; next $1 is first search term
+    if [ $# -eq 0 ]; then
+        [ $TODOTXT_VERBOSE -gt 0 ] && echo "Files in the todo.txt directory:"
+        cd "$TODO_DIR" && ls -1 *.txt
+    else
+        FILE="$1"
+        shift  ## Was filename; next $1 is first search term
 
-    _list "$FILE" "$@"
+        _list "$FILE" "$@"
+    fi
     ;;
 
 "listcon" | "lsc" )
diff --git a/todo_completion b/todo_completion
index c80fba5..7e6bbe6 100644
--- a/todo_completion
+++ b/todo_completion
@@ -26,6 +26,8 @@ _todo()
         case "$prev" in
             command)
                 completions=$COMMANDS;;
+            addto|listfile|lf)
+                completions=$(TODOTXT_VERBOSE=0 todo.sh command listfile);;
             -*) completions="$allCommands $OPTS";;
             *)  case "$cur" in
                     +*) completions=$(TODOTXT_VERBOSE=0 todo.sh command listproj);;