diff --git a/Source/Doc/SystemGuide.md b/Source/Doc/SystemGuide.md
index a27e030d..2d1dcf97 100644
--- a/Source/Doc/SystemGuide.md
+++ b/Source/Doc/SystemGuide.md
@@ -1147,6 +1147,13 @@ contain all sectors requested.  Disk data transfers will be faster if
 the buffer resides in the top 32K of memory because it avoids a
 double buffer copy.
 
+Also for buffers in the top 32K of memory the Bank ID is not
+strictly required as this memory is alway mapped to the common bank.
+For buffers in the bottom 32KB ram, the Bank ID is used to identify
+the bank to use for the buffer. If you do not wih to use banked memory
+you will need to provide the current Bank ID, which can be obtained
+using [Function 0xF3 -- System Get Bank (SYSGETBNK)] 
+
 ### Function 0x14 -- Disk Write (DIOWRITE)
 
 | **Entry Parameters**                   | **Returned Values**                    |
diff --git a/Source/Doc/UserGuide.md b/Source/Doc/UserGuide.md
index 21b81a80..485df903 100644
--- a/Source/Doc/UserGuide.md
+++ b/Source/Doc/UserGuide.md
@@ -2736,7 +2736,14 @@ a variety of common ZCPR3 utilities.
 #### Documentation
 
 ZPM3 has no real documentation.  You are expected to understand both
-CP/M 3 and ZCPR 3.
+CP/M 3 and ZCPR 3. The best source of information is:
+
+* [CPM3 Users Guide]($doc_root$/CPM/CPM3 Users Guide.pdf)
+* [CPM3 Command Summary]($doc_root$/CPM/CPM3 Command Summary.pdf)
+* [CPM3 Programmers Guide]($doc_root$/CPM/CPM3 Programmers Guide.pdf)
+* [CPM3 System Guide]($doc_root$/CPM/CPM3 System Guide.pdf)
+* [Z-System Users Guide]($doc_root$/CPM/Z-System Users Guide.pdf)
+* [ZCPR3.3 User Guide]($doc_root$/CPM/ZCPR3.3 User Guide.pdf)
 
 #### Boot Disk