diff --git a/scans/dskio.s b/scans/dskio.s
index 30cf100..d9b8294 100644
--- a/scans/dskio.s
+++ b/scans/dskio.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 42
 " dskio
 
 dskrd0: 0
@@ -60,6 +61,7 @@ iskio: 0
    dssf
    jmp .-1
    dsrs
+"** 07-13-19.pdf page 43
    sma
    jmp 1f
    isz 3f
@@ -75,4 +77,4 @@ o200000: 0200000
 dskbufp: dskbuf
 
 side: .=.+1
-dskbuf: .=.+640
\ No newline at end of file
+dskbuf: .=.+640
diff --git a/scans/dskres.s b/scans/dskres.s
index ac432bb..c1ea0f5 100644
--- a/scans/dskres.s
+++ b/scans/dskres.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 41
 " dskres
 
    iof
@@ -23,4 +24,4 @@
 
 track: 0
 c1: 0
-d10: 10
\ No newline at end of file
+d10: 10
diff --git a/scans/dsksav.s b/scans/dsksav.s
index 2e79929..51f47be 100644
--- a/scans/dsksav.s
+++ b/scans/dsksav.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 40
 " dsksav
 
    iof
diff --git a/src/cmd/dskio.s b/src/cmd/dskio.s
index e2deae8..d61e682 100644
--- a/src/cmd/dskio.s
+++ b/src/cmd/dskio.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 42
 " dskio
 
 	" Reads 10 blocks from side 0 at block address AC into buffer dskbuf
@@ -94,6 +95,7 @@ dskio: 0
    dsls
    dssf			" wait for ERROR/DONE
    jmp .-1
+"** 07-13-19.pdf page 43
    dsrs			" read disk status into AC, bit 0 indicates errors
    sma			" if bit 0 of AC is set, AC is negative.
 			" if AC is negative, continue below and do another
diff --git a/src/cmd/dskres.s b/src/cmd/dskres.s
index 1c08630..6b0c64c 100644
--- a/src/cmd/dskres.s
+++ b/src/cmd/dskres.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 41
 " dskres
 
 	" Copies the entire file system (except system image and
diff --git a/src/cmd/dsksav.s b/src/cmd/dsksav.s
index 1392be4..f2a0c3d 100644
--- a/src/cmd/dsksav.s
+++ b/src/cmd/dsksav.s
@@ -1,3 +1,4 @@
+"** 07-13-19.pdf page 40
 " dsksav
 
 	" Copies the entire file system (except system image and