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diff --git a/spec/rtems/basedefs/if/alloc-align.yml b/spec/rtems/basedefs/if/alloc-align.yml
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+++ b/spec/rtems/basedefs/if/alloc-align.yml
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+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+brief: |
+  Tells the compiler in a declaration that the memory allocation alignment
+  parameter of this function is similar to aligned_alloc().
+copyrights:
+- Copyright (C) 2018 embedded brains GmbH (http://www.embedded-brains.de)
+definition:
+  default: ''
+  variants:
+  - definition: |
+      __attribute__((__alloc_align__(_index)))
+    enabled-by:
+    - defined(${/compiler/if/gnuc:/name})
+description: null
+enabled-by: true
+interface-type: macro
+links:
+- role: interface-placement
+  uid: header
+- role: interface-ingroup
+  uid: group
+name: RTEMS_ALLOC_ALIGN
+notes: null
+params:
+- description: |
+    is the allocation alignment parameter index (starting with one).
+  dir: null
+  name: _index
+return:
+  return: null
+  return-values: []
+type: interface