Update build-ref.md
Very little typo
Closes #15139.
PiperOrigin-RevId: 438365615
diff --git a/site/en/concepts/build-ref.md b/site/en/concepts/build-ref.md
index bc869b8..086a8c2 100644
--- a/site/en/concepts/build-ref.md
+++ b/site/en/concepts/build-ref.md
@@ -49,7 +49,7 @@
A package is defined as a directory containing a file named `BUILD`
(or `BUILD.bazel`). A package includes all files in its directory, plus
all subdirectories beneath it, except those which themselves contain a
-`BUILD` file. From this definition, no file or directory my be a part of
+`BUILD` file. From this definition, no file or directory may be a part of
two different packages.
For example, in the following directory tree
