diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/ndarray/docs/types/index.d.ts b/lib/node_modules/@stdlib/fft/base/fftpack/ndarray/docs/types/index.d.ts
index d183c29c94b8..e10a04513fa7 100644
--- a/lib/node_modules/@stdlib/fft/base/fftpack/ndarray/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/ndarray/docs/types/index.d.ts
@@ -20,12 +20,18 @@
 
 /* eslint-disable max-lines */
 
+import float64 = require( '@stdlib/fft/base/fftpack/ndarray/float64' );
 import generic = require( '@stdlib/fft/base/fftpack/ndarray/generic' );
 
 /**
 * Interface describing the `ndarray` namespace.
 */
 interface Namespace {
+	/**
+	* Lower-level ndarray wrappers for double-precision floating-point FFTPACK fast Fourier transform routines.
+	*/
+	float64: typeof float64;
+
 	/**
 	* Lower-level ndarray wrappers for generic FFTPACK fast Fourier transform routines.
 	*/