diff --git a/imgui/src/context.rs b/imgui/src/context.rs
index 5cb7abb..67bb786 100644
--- a/imgui/src/context.rs
+++ b/imgui/src/context.rs
@@ -659,7 +659,7 @@ impl Context {
     /// Returns an iterator containing every [`Viewport`](crate::Viewport) that currently exists.
     pub fn viewports_mut(&mut self) -> impl Iterator<Item = &mut crate::Viewport> {
         let slice = self.platform_io_mut().viewports.as_slice();
-        // safe because &self ensures exclusive ownership
+        // safe because &mut self ensures exclusive ownership
         unsafe { slice.iter().map(|ptr| &mut **ptr) }
     }