diff --git a/snippets/isString.md b/snippets/isString.md
index c69ead6da..3b8ae9f88 100644
--- a/snippets/isString.md
+++ b/snippets/isString.md
@@ -1,6 +1,6 @@
 ### isString
 
-Checks if the given argument is a string.
+Checks if the given argument is a string. Only works for string primitives.
 
 Use `typeof` to check if a value is classified as a string primitive.