Typo fix: "in side" -> "inside"
diff --git a/src/lib.rs b/src/lib.rs
index 1129efe..a47d26e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2642,7 +2642,7 @@
/// A ParseCallbacks implementation that will act on file includes by echoing a rerun-if-changed
/// line
///
-/// When running in side a `build.rs` script, this can be used to make cargo invalidate the
+/// When running inside a `build.rs` script, this can be used to make cargo invalidate the
/// generated bindings whenever any of the files included from the header change:
/// ```
/// use bindgen::builder;
