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diff --git a/spec/rtems/clock/if/tick-before.yml b/spec/rtems/clock/if/tick-before.yml
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+++ b/spec/rtems/clock/if/tick-before.yml
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+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+brief: |
+  Returns true if the current ticks counter value indicates a time before the
+  time specified by the tick value and false otherwise.
+copyrights:
+- Copyright (C) 2014, 2020 embedded brains GmbH (http://www.embedded-brains.de)
+definition:
+  default:
+    body: |
+      return (${/c/if/int32_t:/name}) ( ${.:/params[0]/name} - ${/score/watchdog/if/ticks-since-boot:/name} ) > 0;
+    params:
+    - ${../../type/if/interval:/name} ${.:/params[0]/name}
+    return: ${/c/if/bool:/name}
+  variants: []
+description: null
+enabled-by: true
+interface-type: function
+links:
+- role: interface-placement
+  uid: header
+- role: interface-ingroup
+  uid: group
+name: rtems_clock_tick_before
+notes: |
+  This directive can be used to write busy loops with a timeout.
+params:
+- description: is the tick value.
+  dir: null
+  name: tick
+return:
+  return: null
+  return-values:
+  - description: |
+      The current ticks counter value indicates a time before the time
+      specified by the tick value.
+    value: 'true'
+  - description: |
+      Otherwise.
+    value: 'false'
+type: interface