diff --git a/lib/src/stack.h b/lib/src/stack.h
index 1ccd98cd..ec7a69d2 100644
--- a/lib/src/stack.h
+++ b/lib/src/stack.h
@@ -92,11 +92,11 @@ StackSummary *ts_stack_get_summary(Stack *, StackVersion);
 // Get the total cost of all errors on the given version of the stack.
 unsigned ts_stack_error_cost(const Stack *, StackVersion version);
 
-// Determine whether the given two stack versions can be merged.
-bool ts_stack_merge(Stack *, StackVersion, StackVersion);
-
 // Merge the given two stack versions if possible, returning true
 // if they were successfully merged and false otherwise.
+bool ts_stack_merge(Stack *, StackVersion, StackVersion);
+
+// Determine whether the given two stack versions can be merged.
 bool ts_stack_can_merge(Stack *, StackVersion, StackVersion);
 
 TSSymbol ts_stack_resume(Stack *, StackVersion);