diff --git a/README.md b/README.md
index e8e1adc..6477311 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ This Java package is a collection of "lints" (aka "checkers") for
 formatting. This is about best practices and readiness of code
 for successful compilation and execution.
 
-We use this package as a dependency in the 
+We use this package as a dependency in the
 [EO-to-Java compiler][eo]:
 
 ```xml
diff --git a/src/main/resources/org/eolang/lints/errors/abstract-decoratee.xsl b/src/main/resources/org/eolang/lints/errors/abstract-decoratee.xsl
index ca14d7b..681ac85 100644
--- a/src/main/resources/org/eolang/lints/errors/abstract-decoratee.xsl
+++ b/src/main/resources/org/eolang/lints/errors/abstract-decoratee.xsl
@@ -33,9 +33,9 @@ SOFTWARE.
             <xsl:value-of select="if (@line) then @line else '0'"/>
           </xsl:attribute>
           <xsl:attribute name="severity">
-            <xsl:text>error</xsl:text>
+            <xsl:text>warning</xsl:text>
           </xsl:attribute>
-          <xsl:text>Abstract object can't be used as a decoratee</xsl:text>
+          <xsl:text>Abstract object shouldn't be used as a decoratee</xsl:text>
         </xsl:element>
       </xsl:for-each>
     </defects>
diff --git a/src/test/resources/org/eolang/lints/catches-abstract-decoratee.yaml b/src/test/resources/org/eolang/lints/catches-abstract-decoratee.yaml
index afcc9ef..5a869c5 100644
--- a/src/test/resources/org/eolang/lints/catches-abstract-decoratee.yaml
+++ b/src/test/resources/org/eolang/lints/catches-abstract-decoratee.yaml
@@ -23,7 +23,7 @@
 xsls:
   - /org/eolang/lints/errors/abstract-decoratee.xsl
 tests:
-  - /defects[count(defect[@severity='error'])=1]
+  - /defects[count(defect[@severity='warning'])=1]
   - /defects/defect[@line='4']
 eo: |
   # This is the default 64+ symbols comment in front of abstract object.