diff --git a/README.md b/README.md
index cdc1cc4b..93fcf348 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ wp import <file>... --authors=<authors> [--skip=<data-type>]
 Provides a command line interface to the WordPress Importer plugin, for
 performing data migrations.
 
+Use `define( 'IMPORT_DEBUG', true );` for more verbosity during importing.
+
 **OPTIONS**
 
 	<file>...
diff --git a/src/Import_Command.php b/src/Import_Command.php
index 4ce1f2f2..34636a22 100644
--- a/src/Import_Command.php
+++ b/src/Import_Command.php
@@ -10,6 +10,8 @@ class Import_Command extends WP_CLI_Command {
 	 * Provides a command line interface to the WordPress Importer plugin, for
 	 * performing data migrations.
 	 *
+	 * Use `define( 'IMPORT_DEBUG', true );` for more verbosity during importing.
+	 *
 	 * ## OPTIONS
 	 *
 	 * <file>...