[varfonts] Fetch optical-size for named instances
diff --git a/src/fcfreetype.c b/src/fcfreetype.c
index e19afe5..0d03208 100644
--- a/src/fcfreetype.c
+++ b/src/fcfreetype.c
@@ -1318,7 +1318,10 @@
 		  width_mult = mult;
 		  break;
 
-		/* TODO optical size! */
+		case FT_MAKE_TAG ('o','p','s','z'):
+		  if (!FcPatternAddDouble (pat, FC_SIZE, value))
+		      goto bail1;
+		  break;
 	    }
 	  }
 	}