diff --git a/TODO.md b/TODO.md
index 2fd4cc3..7d0f51f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -255,7 +255,7 @@ Current status:
   `TEXT` and creator `MARS`.  The helper writes 32 bytes of FinderInfo to
   `org.mars-nwe.afp.finder-info`, stores the narrow attribute word in
   `org.mars-nwe.afp.attributes`, and verifies the result through AFP 2.0 Get
-  File Information.  The smoke-suite report helper now has a green
+  File Information.  The smoke-suite report helper now includes FinderInfo plus Invisible/System/Backup set/clear probes and has a green
   `failures=0` run for `SYS:PUBLIC/pmdflts.ini`; that run confirms the corrected
   FinderInfo payload alignment by reading
   `user.org.mars-nwe.afp.finder-info=0x544558544d415253...` (`TEXTMARS` with no
@@ -267,7 +267,9 @@ Current status:
   describes the entry-id origin, not the FinderInfo write result.  Follow-up
   probes should read the cached mars_nwe entry id and omit the fallback marker.
   System and Backup are now supported by the same narrow xattr-only attribute
-  path.  All other Set File Information bits and AFP attribute bits remain
+  path; runtime probes verified System set/clear and Backup set with AFP-visible
+  attrs `0x0004`, `0x0000`, and `0x0040`, with server diagnostics showing the
+  matching WebSDK SETCLR forms `0x8004`, `0x0004`, and `0x8040`.  All other Set File Information bits and AFP attribute bits remain
   rejected until their write/enforcement semantics are explicitly designed.
 - The AFP dispatcher now decodes the WebSDK/NWAFP subfunction number in
   diagnostics so real client probes can be mapped to the corresponding AFP
diff --git a/tests/linux/README.md b/tests/linux/README.md
index 2ce9bcf..f985b5e 100644
--- a/tests/linux/README.md
+++ b/tests/linux/README.md
@@ -56,8 +56,8 @@ Example from the build `tests/linux` directory:
 
 The report includes AFP Entry ID, Entry ID From NetWare Handle, Get File
 Information, Scan File Information, Alloc Temporary Directory Handle, Open File
-Fork, FinderInfo Set File Information, Invisible Set/Clear File Information,
-and the Linux xattr checks for:
+Fork, FinderInfo Set File Information, Invisible/System/Backup Set/Clear File
+Information, and the Linux xattr checks for:
 
 ```text
 user.org.mars-nwe.afp.finder-info
@@ -65,6 +65,13 @@ user.org.mars-nwe.afp.attributes
 user.org.mars-nwe.afp.entry-id
 ```
 
+
+The suite now also exercises the additional metadata-only AFP attribute bits that
+`afp_set_file_info_smoke` supports: System (`0x0004`) and Backup (`0x0040`).
+It clears both again before the final xattr dump so repeated runs leave the
+attribute payload in the clean `0x01000000` state unless a previous command
+fails.
+
 Use `--no-log` when the log file is unavailable or when the server log is being
 collected separately.  Use `--stop-on-failure` for strict bisect-style runs; by
 default the script keeps going so one failing endpoint does not hide later AFP
@@ -87,7 +94,7 @@ The FinderInfo value starts with `TEXTMARS` without a leading padding byte, so
 the smoke helper and server now agree on the WebSDK/NWAFP Set File Information
 payload alignment.  The server log excerpt for the same run showed all AFP
 operations returning successfully, including `mask=0x0020` for FinderInfo and
-`mask=0x0001` for the Invisible set/clear probes.
+`mask=0x0001` for the Invisible/System/Backup attribute probes.
 
 ## AFP Entry ID smoke test
 
@@ -542,6 +549,18 @@ attribute mutation:
 
 For System the xattr value stores `0x01000004`; for Backup it stores
 `0x01000040`.  Use `--clear-system` and `--clear-backup` to remove those bits.
+
+Verified runtime probes for the additional bits showed the expected AFP-visible
+attribute words and server diagnostics:
+
+```text
+AFP Set File Info path=SYS:PUBLIC/pmdflts.ini bitmap=0x0001 attrs=0x0004 finder_type=TEXT finder_creator=MARS entry_id=0x62ecb463 verified
+AFP Set File Info path=SYS:PUBLIC/pmdflts.ini bitmap=0x0001 attrs=0x0000 finder_type=TEXT finder_creator=MARS entry_id=0x62ecb463 verified
+AFP Set File Info path=SYS:PUBLIC/pmdflts.ini bitmap=0x0001 attrs=0x0040 finder_type=TEXT finder_creator=MARS entry_id=0x62ecb463 verified
+AFP 2.0 Set File Information: vol=0 request_vol=0 entry=0x00000000 mask=0x0001 path='SYS:PUBLIC/pmdflts.ini' attributes attrs=0x8004
+AFP 2.0 Set File Information: vol=0 request_vol=0 entry=0x00000000 mask=0x0001 path='SYS:PUBLIC/pmdflts.ini' attributes attrs=0x0004
+AFP 2.0 Set File Information: vol=0 request_vol=0 entry=0x00000000 mask=0x0001 path='SYS:PUBLIC/pmdflts.ini' attributes attrs=0x8040
+```
 All other Set File Information bitmap bits and AFP attribute bits, including
 NoWrite, NoRename, NoDelete, NoCopy, and the computed data/resource-fork-open
 flags, are intentionally rejected for now.  That keeps timestamp,
diff --git a/tests/linux/afp_smoke_suite.sh b/tests/linux/afp_smoke_suite.sh
index e4bc5cb..500470d 100755
--- a/tests/linux/afp_smoke_suite.sh
+++ b/tests/linux/afp_smoke_suite.sh
@@ -247,6 +247,30 @@ run_cmd \
     "$SCRIPT_DIR/afp_set_file_info_smoke" -S "$SERVER" -U "$USER_NAME" -P "$PASSWORD" \
         --attributes-only --clear-invisible "$NETWARE_PATH"
 
+run_cmd \
+    "AFP Set File Information System" \
+    "./afp_set_file_info_smoke $COMMON_PRINT --attributes-only --system '$NETWARE_PATH'" \
+    "$SCRIPT_DIR/afp_set_file_info_smoke" -S "$SERVER" -U "$USER_NAME" -P "$PASSWORD" \
+        --attributes-only --system "$NETWARE_PATH"
+
+run_cmd \
+    "AFP Set File Information Clear System" \
+    "./afp_set_file_info_smoke $COMMON_PRINT --attributes-only --clear-system '$NETWARE_PATH'" \
+    "$SCRIPT_DIR/afp_set_file_info_smoke" -S "$SERVER" -U "$USER_NAME" -P "$PASSWORD" \
+        --attributes-only --clear-system "$NETWARE_PATH"
+
+run_cmd \
+    "AFP Set File Information Backup" \
+    "./afp_set_file_info_smoke $COMMON_PRINT --attributes-only --backup '$NETWARE_PATH'" \
+    "$SCRIPT_DIR/afp_set_file_info_smoke" -S "$SERVER" -U "$USER_NAME" -P "$PASSWORD" \
+        --attributes-only --backup "$NETWARE_PATH"
+
+run_cmd \
+    "AFP Set File Information Clear Backup" \
+    "./afp_set_file_info_smoke $COMMON_PRINT --attributes-only --clear-backup '$NETWARE_PATH'" \
+    "$SCRIPT_DIR/afp_set_file_info_smoke" -S "$SERVER" -U "$USER_NAME" -P "$PASSWORD" \
+        --attributes-only --clear-backup "$NETWARE_PATH"
+
 if command -v getfattr >/dev/null 2>&1; then
     run_cmd \
         "Linux xattr: AFP FinderInfo" \