diff --git a/src/m/convex.h b/src/m/convex.h
index 272a033e36c..a0fbd6223df 100644
--- a/src/m/convex.h
+++ b/src/m/convex.h
@@ -190,5 +190,6 @@ Boston, MA 02111-1307, USA.  */
     '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
 #endif
 
-/* The convex has sys/wait.h but it does not work right.  */
+/* There is some indication that the convex has sys/wait.h
+   but it does not work right.  */
 #undef HAVE_SYS_WAIT_H
diff --git a/src/s/hpux.h b/src/s/hpux.h
index 8b7bded93aa..c7842f1d6df 100644
--- a/src/s/hpux.h
+++ b/src/s/hpux.h
@@ -217,5 +217,5 @@ Boston, MA 02111-1307, USA.  */
 /* This triggers a conditional in xfaces.c.  */
 #define XOS_NEEDS_TIME_H
 
-/* HPUX 7 has sys/wait.h but it does not work right.  */
+/* It's possible that HPUX 7 has sys/wait.h but it does not work right.  */
 #undef HAVE_SYS_WAIT_H