diff --git a/.github/.keepalive b/.github/.keepalive
deleted file mode 100644
index d776f51..0000000
--- a/.github/.keepalive
+++ /dev/null
@@ -1 +0,0 @@
-2023-06-01T02:16:36.847Z
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 2b5297f..0c2727b 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -16,6 +16,7 @@ Joey Reed <joeyrreed@gmail.com>
 Jordan-Gallivan <115050475+Jordan-Gallivan@users.noreply.github.com>
 Joris Labie <joris.labie1@gmail.com>
 Justin Dennison <justin1dennison@gmail.com>
+KATTA NAGA NITHIN <88046362+nithinkatta@users.noreply.github.com>
 Marcus <mfantham@users.noreply.github.com>
 Matt Cochrane <matthew.cochrane.eng@gmail.com>
 Milan Raj <rajsite@users.noreply.github.com>
diff --git a/docs/types/index.d.ts b/docs/types/index.d.ts
index 5d14b05..b5fd52b 100644
--- a/docs/types/index.d.ts
+++ b/docs/types/index.d.ts
@@ -36,7 +36,7 @@
 * var bool = isBinaryString( '' );
 * // returns false
 */
-declare function isBinaryString( value: any ): boolean;
+declare function isBinaryString( value: any ): value is string;
 
 
 // EXPORTS //