diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index 086634491c2350447cbe46733bb06482dcbc4551..a8f2388101f5d50ebb9049ad656ed329b18eec80 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -238,8 +238,8 @@
     #error "MESH_BED_LEVELING does not yet support DELTA printers."
   #elif ENABLED(AUTO_BED_LEVELING_FEATURE)
     #error "Select AUTO_BED_LEVELING_FEATURE or MESH_BED_LEVELING, not both."
-  #elif MESH_NUM_X_POINTS > 7 || MESH_NUM_Y_POINTS > 7
-    #error "MESH_NUM_X_POINTS and MESH_NUM_Y_POINTS need to be less than 8."
+  #elif MESH_NUM_X_POINTS > 9 || MESH_NUM_Y_POINTS > 9
+    #error "MESH_NUM_X_POINTS and MESH_NUM_Y_POINTS must be less than 10."
   #endif
 #elif ENABLED(MANUAL_BED_LEVELING)
   #error "MESH_BED_LEVELING is required for MANUAL_BED_LEVELING."
diff --git a/Marlin/configuration_store.cpp b/Marlin/configuration_store.cpp
index ab5af80647c1152bf42267fa2ad8fcc71b70e349..b203bbb624ca3433b45bf4e7446518e5842522ab 100644
--- a/Marlin/configuration_store.cpp
+++ b/Marlin/configuration_store.cpp
@@ -67,7 +67,7 @@
  *  203            z_offset (float)
  *  207            mesh_num_x (uint8 as set in firmware)
  *  208            mesh_num_y (uint8 as set in firmware)
- *  209 G29 S3 XYZ z_values[][] (float x9, by default)
+ *  209 G29 S3 XYZ z_values[][] (float x9, by default, up to float x 81)
  *
  * AUTO BED LEVELING
  *  245  M851      zprobe_zoffset (float)