diff --git a/configs/README.txt b/configs/README.txt
index b0e6b16d15a..d4486daaf80 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -284,7 +284,7 @@ defconfig -- This is a configuration file similar to the Linux
     CONFIG_MM_REGIONS - If the architecture includes multiple
       regions of memory to allocate from, this specifies the
       number of memory regions that the memory manager must
-      handle and enables the API mm_addregion(start, end);
+      handle and enables the API mm_addregion(heap, start, end);
     CONFIG_MM_SMALL - Each memory allocation has a small allocation
       overhead.  The size of that overhead is normally determined by
       the "width" of the address support by the MCU.  MCUs that support
diff --git a/configs/rgmp/x86/cxxtest/defconfig b/configs/rgmp/x86/cxxtest/defconfig
index b1634e1e50a..2b19192e432 100644
--- a/configs/rgmp/x86/cxxtest/defconfig
+++ b/configs/rgmp/x86/cxxtest/defconfig
@@ -63,7 +63,7 @@ CONFIG_ARCH_BOARD_RGMP=y
 # CONFIG_MM_REGIONS - If the architecture includes multiple
 #   regions of memory to allocate from, this specifies the
 #   number of memory regions that the memory manager must
-#   handle and enables the API mm_addregion(start, end);
+#   handle and enables the API mm_addregion(heap, start, end);
 # CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
 #   time console output
 # CONFIG_MSEC_PER_TICK - The default system timer is 100Hz
diff --git a/configs/rgmp/x86/helloxx/defconfig b/configs/rgmp/x86/helloxx/defconfig
index 1591952242f..9266bad8127 100644
--- a/configs/rgmp/x86/helloxx/defconfig
+++ b/configs/rgmp/x86/helloxx/defconfig
@@ -63,7 +63,7 @@ CONFIG_ARCH_BOARD_RGMP=y
 # CONFIG_MM_REGIONS - If the architecture includes multiple
 #   regions of memory to allocate from, this specifies the
 #   number of memory regions that the memory manager must
-#   handle and enables the API mm_addregion(start, end);
+#   handle and enables the API mm_addregion(heap, start, end);
 # CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
 #   time console output
 # CONFIG_MSEC_PER_TICK - The default system timer is 100Hz