diff --git a/src/lib/core/option/optgroup.html b/src/lib/core/option/optgroup.html
index 31ebcf492d66..3789257f3869 100644
--- a/src/lib/core/option/optgroup.html
+++ b/src/lib/core/option/optgroup.html
@@ -1,2 +1,2 @@
-<label class="mat-optgroup-label" [id]="_labelId">{{ label }}</label>
+<label class="mat-optgroup-label" [id]="_labelId">{{ label }} <ng-content></ng-content></label>
 <ng-content select="mat-option, ng-container"></ng-content>