diff --git a/crates/bevy_diagnostic/src/diagnostic.rs b/crates/bevy_diagnostic/src/diagnostic.rs
index 6fa04ce573f20..693642c5d6a39 100644
--- a/crates/bevy_diagnostic/src/diagnostic.rs
+++ b/crates/bevy_diagnostic/src/diagnostic.rs
@@ -227,10 +227,15 @@ impl DiagnosticsStore {
             .and_then(|diagnostic| diagnostic.measurement())
     }
 
-    /// Return an iterator over all [`Diagnostic`].
+    /// Return an iterator over all [`Diagnostic`]s.
     pub fn iter(&self) -> impl Iterator<Item = &Diagnostic> {
         self.diagnostics.values()
     }
+
+    /// Return an iterator over all [`Diagnostic`]s, by mutable reference.
+    pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Diagnostic> {
+        self.diagnostics.values_mut()
+    }
 }
 
 /// Record new [`DiagnosticMeasurement`]'s.