diff --git a/changes/367.feature.rst b/changes/367.feature.rst
new file mode 100644
index 00000000..6074ccb3
--- /dev/null
+++ b/changes/367.feature.rst
@@ -0,0 +1 @@
+Modify warning filters to re-show identical ValidationWarnings on re-validation.
diff --git a/src/stdatamodels/validate.py b/src/stdatamodels/validate.py
index 4131ffea..a2113f0a 100644
--- a/src/stdatamodels/validate.py
+++ b/src/stdatamodels/validate.py
@@ -18,6 +18,11 @@ class ValidationWarning(Warning):
     pass
 
 
+# always show validation warnings unless another filter was added that
+# matches these warnings (by passing append=True)
+warnings.filterwarnings("always", category=ValidationWarning, append=True)
+
+
 def value_change(path, value, schema, ctx):
     """
     Validate a change in value against a schema.