graal/com.oracle.graal.api.replacements/src/com/oracle/graal/api/replacements/SubstitutionGuard.java

*** 24,33 ****
--- 24,39 ----
  package com.oracle.graal.api.replacements;
  
  /**
   * Guards the installation of substitutions for {@link ClassSubstitution} and
   * {@link MethodSubstitution}.
+  * <p>
+  * Implementor must have a single public constructor with one of the following signatures:
+  * <ul>
+  * <li><code>Guard(Architecture)</code>
+  * <li><code>Guard()</code> (an implicit constructor is OK as well)
+  * </ul>
   */
  public interface SubstitutionGuard {
  
      /**
       * Return true if the substitution should be enabled.