diff --git a/include/lutil_sha1.h b/include/lutil_sha1.h
index 1f335065a0..cd2430c8d8 100644
--- a/include/lutil_sha1.h
+++ b/include/lutil_sha1.h
@@ -25,6 +25,8 @@ LDAP_BEGIN_DECL
  * By Steve Reid <steve@edmweb.com>
  */
 
+/* This code assumes char are 8-bits and uint32 are 32-bits */
+
 #ifndef LDAP_UINT32
 #define LDAP_UINT32 1
 typedef ac_uint4 uint32;