diff --git a/mm/umm_heap/umm_calloc.c b/mm/umm_heap/umm_calloc.c
index 7c782c97909..5913bd2d32d 100644
--- a/mm/umm_heap/umm_calloc.c
+++ b/mm/umm_heap/umm_calloc.c
@@ -45,7 +45,7 @@
  *
  ****************************************************************************/
 
-#undef calloc /* See mm/README.txt */
+#undef calloc
 FAR void *calloc(size_t n, size_t elem_size)
 {
 #if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
diff --git a/mm/umm_heap/umm_free.c b/mm/umm_heap/umm_free.c
index 446fb48c015..72cccdc81c0 100644
--- a/mm/umm_heap/umm_free.c
+++ b/mm/umm_heap/umm_free.c
@@ -45,7 +45,7 @@
  *
  ****************************************************************************/
 
-#undef free /* See mm/README.txt */
+#undef free
 void free(FAR void *mem)
 {
   mm_free(USR_HEAP, mem);
diff --git a/mm/umm_heap/umm_malloc.c b/mm/umm_heap/umm_malloc.c
index ce1f639836c..22cf89bb163 100644
--- a/mm/umm_heap/umm_malloc.c
+++ b/mm/umm_heap/umm_malloc.c
@@ -51,7 +51,7 @@
  *
  ****************************************************************************/
 
-#undef malloc /* See mm/README.txt */
+#undef malloc
 FAR void *malloc(size_t size)
 {
 #if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
diff --git a/mm/umm_heap/umm_malloc_size.c b/mm/umm_heap/umm_malloc_size.c
index 98e2f8198e2..c19c5c65395 100644
--- a/mm/umm_heap/umm_malloc_size.c
+++ b/mm/umm_heap/umm_malloc_size.c
@@ -36,7 +36,7 @@
  * Public Functions
  ****************************************************************************/
 
-#undef malloc_size /* See mm/README.txt */
+#undef malloc_size
 size_t malloc_size(FAR void *mem)
 {
   return mm_malloc_size(USR_HEAP, mem);
diff --git a/mm/umm_heap/umm_memalign.c b/mm/umm_heap/umm_memalign.c
index bb37e2d20df..11a2f47f44e 100644
--- a/mm/umm_heap/umm_memalign.c
+++ b/mm/umm_heap/umm_memalign.c
@@ -50,7 +50,7 @@
  *
  ****************************************************************************/
 
-#undef memalign /* See mm/README.txt */
+#undef memalign
 FAR void *memalign(size_t alignment, size_t size)
 {
 #if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
diff --git a/mm/umm_heap/umm_realloc.c b/mm/umm_heap/umm_realloc.c
index f8e5ccc98b2..677e2249d2d 100644
--- a/mm/umm_heap/umm_realloc.c
+++ b/mm/umm_heap/umm_realloc.c
@@ -52,7 +52,7 @@
  *
  ****************************************************************************/
 
-#undef realloc /* See mm/README.txt */
+#undef realloc
 FAR void *realloc(FAR void *oldmem, size_t size)
 {
 #if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
diff --git a/mm/umm_heap/umm_zalloc.c b/mm/umm_heap/umm_zalloc.c
index ef023afe561..7be29487aa7 100644
--- a/mm/umm_heap/umm_zalloc.c
+++ b/mm/umm_heap/umm_zalloc.c
@@ -51,7 +51,7 @@
  *
  ****************************************************************************/
 
-#undef zalloc /* See mm/README.txt */
+#undef zalloc
 FAR void *zalloc(size_t size)
 {
 #ifdef CONFIG_ARCH_ADDRENV