diff --git a/abduco.c b/abduco.c
index 7a9012e..8fdc404 100644
--- a/abduco.c
+++ b/abduco.c
@@ -576,7 +576,7 @@ int main(int argc, char *argv[]) {
 
 	char *default_cmd[4] = { "/bin/sh", "-c", getenv("ABDUCO_CMD"), NULL };
 	if (!default_cmd[2]) {
-		default_cmd[0] = "dvtm";
+		default_cmd[0] = ABDUCO_CMD;
 		default_cmd[1] = NULL;
 	}
 
diff --git a/config.def.h b/config.def.h
index 5b6c88e..ae9bfbc 100644
--- a/config.def.h
+++ b/config.def.h
@@ -1,6 +1,9 @@
+/* default command to execute if non is given and $ABDUCO_CMD is unset */
+#define ABDUCO_CMD "dvtm"
+/* default detach key, can be overriden at run time using -e option */
 static char KEY_DETACH = CTRL('\\');
+/* redraw key to send a SIGWINCH signal to underlying process (unused by default) */
 static char KEY_REDRAW = 0;
-
 /* Where to place the "abduco" directory storing all session socket files.
  * The first directory to succeed is used. */
 static struct Dir {