diff --git a/Documentation/s390/Debugging390.txt b/Documentation/s390/Debugging390.txt
index 3f9ddbc..09939696 100644
--- a/Documentation/s390/Debugging390.txt
+++ b/Documentation/s390/Debugging390.txt
@@ -480,7 +480,7 @@
 r3       argument 1 / return value 1 (if long long) call-clobbered
 r4       argument 2                                 call-clobbered
 r5       argument 3                                 call-clobbered
-r6	 argument 5                                 saved
+r6	 argument 4				    saved
 r7       pointer-to arguments 5 to ...              saved      
 r8       this & that                                saved
 r9       this & that                                saved