Typo in foreign.h

diff --git a/src/include/foreign/foreign.h b/src/include/foreign/foreign.h
index 5dc2c90..143566a 100644
--- a/src/include/foreign/foreign.h
+++ b/src/include/foreign/foreign.h
@@ -23,7 +23,7 @@
 
 /*
  * Generic option types for validation.
- * NB! Thes are treated as flags, so use only powers of two here.
+ * NB! These are treated as flags, so use only powers of two here.
  */
 typedef enum
 {