diff --git a/lib/src/clixon_datastore_write.c b/lib/src/clixon_datastore_write.c
index f9d25e71..c57c21af 100644
--- a/lib/src/clixon_datastore_write.c
+++ b/lib/src/clixon_datastore_write.c
@@ -578,6 +578,9 @@ text_modify(clicon_handle       h,
 			if ((yc = yang_anydata_add(y0, x1cname)) < 0)
 			    goto done;
 			xml_spec_set(x1c, yc);
+			clicon_log(LOG_WARNING,
+				   "%s: %d: No YANG spec for %s, anydata used",
+				   __FUNCTION__, __LINE__, x1cname);
 		    }
 		    else{
 			if (netconf_unknown_element(cbret, "application", x1cname, "Unassigned yang spec") < 0)
@@ -783,6 +786,9 @@ text_modify_top(clicon_handle       h,
 		if ((yc = yang_anydata_add(ymod, x1cname)) < 0)
 		    goto done;
 		xml_spec_set(x1c, yc);
+		clicon_log(LOG_WARNING,
+			   "%s: %d: No YANG spec for %s, anydata used",
+			   __FUNCTION__, __LINE__, x1cname);
 	    }
 	    else{
 		if (netconf_unknown_element(cbret, "application", x1cname, "Unassigned yang spec") < 0)
diff --git a/lib/src/clixon_validate.c b/lib/src/clixon_validate.c
index 0ef73102..23f52426 100644
--- a/lib/src/clixon_validate.c
+++ b/lib/src/clixon_validate.c
@@ -1093,8 +1093,12 @@ xml_yang_validate_all(clicon_handle h,
        and !Node has a config sub-statement and it is false */
     ys=xml_spec(xt);
     if (ys==NULL){
-	if (clicon_option_bool(h, "CLICON_YANG_UNKNOWN_ANYDATA") == 1)
+	if (clicon_option_bool(h, "CLICON_YANG_UNKNOWN_ANYDATA") == 1) {
+	    clicon_log(LOG_WARNING,
+		       "%s: %d: No YANG spec for %s, validation skipped",
+		       __FUNCTION__, __LINE__, xml_name(xt));
 	    goto ok;
+	}
 	if ((cb = cbuf_new()) == NULL){
 	    clicon_err(OE_UNIX, errno, "cbuf_new");
 	    goto done;
diff --git a/lib/src/clixon_xml_bind.c b/lib/src/clixon_xml_bind.c
index 67bb067b..c965cd3e 100644
--- a/lib/src/clixon_xml_bind.c
+++ b/lib/src/clixon_xml_bind.c
@@ -173,6 +173,9 @@ populate_self_parent(cxobj  *xt,
 		goto done;
 	    xml_spec_set(xt, y);
 	    retval = 2; /* treat as anydata */
+	    clicon_log(LOG_WARNING,
+		       "%s: %d: No YANG spec for %s, anydata used",
+		       __FUNCTION__, __LINE__, name);
 	    goto done;
 	}
 	if ((cb = cbuf_new()) == NULL){
@@ -267,6 +270,9 @@ populate_self_top(cxobj     *xt,
 		goto done;
 	    xml_spec_set(xt, y);
 	    retval = 2; /* treat as anydata */
+	    clicon_log(LOG_WARNING,
+		       "%s: %d: No YANG spec for %s, anydata used",
+		       __FUNCTION__, __LINE__, name);
 	    goto done;
 	}
 	if ((cb = cbuf_new()) == NULL){