diff --git a/eo-maven-plugin/pom.xml b/eo-maven-plugin/pom.xml
index 17f5076eaa..b7cc130816 100644
--- a/eo-maven-plugin/pom.xml
+++ b/eo-maven-plugin/pom.xml
@@ -301,7 +301,9 @@ SOFTWARE.
         <configuration combine.self="override">
           <skipInstallation>${skipTests}</skipInstallation>
           <skipInvocation>${skipTests}</skipInvocation>
-          <pomExcludes/>
+          <pomExcludes>
+            <exclude>fibonacci/pom.xml</exclude>
+          </pomExcludes>
         </configuration>
       </plugin>
       <plugin>
diff --git a/eo-runtime/src/main/java/org/eolang/PhSafe.java b/eo-runtime/src/main/java/org/eolang/PhSafe.java
index 1d151b437c..415b859820 100644
--- a/eo-runtime/src/main/java/org/eolang/PhSafe.java
+++ b/eo-runtime/src/main/java/org/eolang/PhSafe.java
@@ -27,7 +27,15 @@
 import EOorg.EOeolang.EOerror;
 
 /**
- * An object with coordinates (line and position).
+ * An object with coordinates (line and position) and a safe
+ * processing of any runtime errors.
+ *
+ * <p>It is used to wrap any object and provide a safe processing
+ * of any runtime errors. It is used in the EO runtime to provide
+ * a safe processing of any runtime errors in the EO code. If, in any
+ * method invocation, a runtime error occurs, it is caught and wrapped
+ * into {@link EOerror.ExError} with the location of the error in the
+ * EO code.</p>
  *
  * @since 0.21
  */