diff --git a/docs/reference/gtk/css-properties.xml b/docs/reference/gtk/css-properties.xml
index c53cbbf730..cfca161678 100644
--- a/docs/reference/gtk/css-properties.xml
+++ b/docs/reference/gtk/css-properties.xml
@@ -623,6 +623,16 @@ We use <literallayout> for syntax productions, and each line is put in a <code>
             <row><entry>Name</entry><entry>Value</entry><entry>Initial</entry><entry>Inh.</entry><entry>Ani.</entry><entry>Reference</entry><entry>Notes</entry></row>
           </thead>
           <tbody>
+            <row>
+              <entry><phrase role="nowrap">transform</phrase></entry>
+              <entry><code>none | 〈transform〉+</code></entry>
+              <entry><code>none</code></entry>
+              <entry></entry>
+              <entry>✓</entry>
+              <entry><ulink url="https://www.w3.org/TR/css-transforms-1/">CSS3</ulink>,
+                     <ulink url="https://drafts.csswg.org/css-transforms-2/">3D</ulink></entry>
+              <entry></entry>
+            </row>
             <row>
               <entry><phrase role="nowrap">min-width</phrase></entry>
               <entry><code>〈length〉</code></entry>
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index ac8cf75974..62ddce3cd0 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -1609,7 +1609,6 @@ _gtk_css_style_property_init_properties (void)
                                           filter_value_parse,
                                           NULL,
                                           gtk_css_filter_value_new_none ());
-
   gtk_css_style_property_register        ("border-spacing",
                                           GTK_CSS_PROPERTY_BORDER_SPACING,
                                           G_TYPE_NONE,
@@ -1620,6 +1619,14 @@ _gtk_css_style_property_init_properties (void)
                                           _gtk_css_position_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
                                                                        _gtk_css_number_value_new (0, GTK_CSS_PX)));
 
+  gtk_css_style_property_register        ("transform",
+                                          GTK_CSS_PROPERTY_TRANSFORM,
+                                          G_TYPE_NONE,
+                                          GTK_STYLE_PROPERTY_ANIMATED,
+                                          GTK_CSS_AFFECTS_SIZE,
+                                          transform_value_parse,
+                                          NULL,
+                                          _gtk_css_transform_value_new_none ());
   gtk_css_style_property_register        ("min-width",
                                           GTK_CSS_PROPERTY_MIN_WIDTH,
                                           G_TYPE_INT,
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index 218a15980c..e305fdfb9d 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -222,6 +222,7 @@ enum { /*< skip >*/
   GTK_CSS_PROPERTY_ICON_TRANSFORM,
   GTK_CSS_PROPERTY_ICON_FILTER,
   GTK_CSS_PROPERTY_BORDER_SPACING,
+  GTK_CSS_PROPERTY_TRANSFORM,
   GTK_CSS_PROPERTY_MIN_WIDTH,
   GTK_CSS_PROPERTY_MIN_HEIGHT,
   GTK_CSS_PROPERTY_TRANSITION_PROPERTY,